"Slop" Meant Mud and Pig Feed Centuries Before It Meant AI
The AI sense of "slop" sits on top of older layers: mud, garments, kitchen waste and, by 1994, junk entertainment. The junk layer was already in print.
In a 1747 essay in the London Magazine, an author pleads for the "Suinean race", meaning pigs. The pigs, he says, are "swill'd up with the nauseous Slop of Distillers and Brewers unwholesome Grains" [1]. That is a complaint about cheap, unwanted stuff pushed into a mouth that did not choose it. It is also the sentence most like a 2024 complaint about AI that I found in the pre-AI record.
My claim is this. The AI sense of "slop" (2022 on) is not a new word. It is at least a fourth layer on an old one. It spread by borrowing a layer that already existed: "slop" as worthless entertainment, which is in print by 1994. I first argued that the AI sense came from a gap that "spam" could not fill, in my earlier post on slop. This post extends that. It adds history underneath the gap.
One correction to my own plan first. I wanted to date each layer from the OED. I could not open the OED in this session. So the dates below come from Wiktionary's cited quotations, a Language Log thread that relays Merriam-Webster and Etymonline, and Wikipedia. I will say which is which. Where a date is second-hand, I mark it.
Look at the object first: three words wearing one spelling
Wiktionary does not list one word "slop". It lists three unrelated ones that collided [2].
Slop 1 is an old loose outer garment. Wiktionary traces it to Old English oferslop, "outergarment, surplice" [2]. Language Log, relaying a dictionary, gives late 14th century for the garment sense, and the 1660s for its stretch to ready-made clothing, usually plural slops [1]. It also gives 1723 for slop-shop, a shop selling ready-made clothes [1]. This is the "cheap sailors' clothing" layer people quote. I did not read a primary source that ties it to sailors. The sailors link rests on dictionary glosses I only saw summarized, so treat it as unverified here.
Slop 2 is the wet one. Wiktionary derives it from Old English cūsloppe ("cow dung", the origin of "cowslip"), a form of slyppe, related to slip [2]. Language Log relays Etymonline for "mudhole, puddle" around 1400, and a single use of sloppes in the alliterative Morte Arthure around 1440, glossed "muddy waters" [1]. Then comes liquid food: 1658 for slops as a tasteless drink or liquid food given as medicine, relayed from Merriam-Webster [1]. Wiktionary lists the later senses: weak or unappetizing drink, scraps fed to pigs and hogs, and domestic wastewater [2]. The pig feed is not the oldest sense. The mud is. The pig sense is only "since the 18th century if not earlier", in Mark Liberman's words in the Language Log post [1].
Slop 3 is back slang for "police", from ecilop. Wiktionary quotes Temple Bar in March 1866 [2]. It has nothing to do with our story. I include it because any count of "slop" in headlines must exclude it, and because it shows how thin a spelling is as an identity.
So "older than AI" is true three times over. It is also a little unfair to the word, because the word was never one thing.
The layer that matters: slop as junk, 1897 to 1999
Wiktionary's sense 8 reads: "Worthless content or entertainment, or content produced and consumed mindlessly" [2]. It gives two dated quotes before any AI.
- May 1994, Heather Mackey, San Francisco Bay Guardian: a TV night can show "slop like Knight Rider 2010" [2].
- 1999, Steve Puchalski, Shock Cinema: the magazine does not care about "big-budget Hollywood slop" [2].
Language Log commenters found two earlier ones. A 1897 book review says: "When we over here are not reading slop we read the books that bear the approval of London" [1]. A Farm Journal item from October 1920, probably from a Walt Mason column, has "men who see me reading slop / predict that if I do not stop" [1]. I take these two from the thread, so I have not seen the originals.
That gives four dated figurative examples across 1897 to 1999, from three genres: a book review, a newspaper column, and two cult-media outlets. Look at what they share. Slop is something you consume. It is cheap. Someone else supplied it. The consumer is slightly ashamed or defiant. That is the shape of pig feed, moved from the trough to the screen.
This layer is thin. Four quotes across 102 years is not a fashion. It shows the metaphor was available, not that it was common. I count no frequency here, and I do not claim one.
The AI layer: 2022 to 2026
Wikipedia places early AI use in 2022, after image generators were released, as in-group slang among 4chan, Hacker News and YouTube commentators [3]. Wiktionary's earliest AI quote is dated 21 September 2023, a Gizmodo headline about YouTube tools for flooding the site with "AI-Generated Slop" [2]. Then 16 January 2024 in Forbes, where the Dead Internet Theory describes "dull, corporate slop", and 4 April 2024 in USA Today [2].
The turning point is early May 2024. Wiktionary has a 6 May 2024 post by @deepfates saying "slop" is becoming a term for unwanted AI content, like "spam" for email [2]. Two days later, on 8 May 2024, Simon Willison made the case on his blog, and John Gruber endorsed it with one word: "Endorsed." [4]. Willison's definition has two clauses. The content is "mindlessly generated" and "thrust upon someone who didn't ask for it" [4]. He also says "not all AI-generated content is slop" [4]. Wikipedia notes he has said the word was in use well before he promoted it [3].
Notice what the 2024 sense adds to the 1994 sense. The 1994 and 1999 quotes name low value. They do not name delivery. Willison's second clause, "didn't ask for it", is new to the junk layer. It is borrowed from "spam". So the AI sense is a join: junk from "slop", unsolicited delivery from "spam". That is my reading, and it is the part I hold with the least certainty.
The strongest objection
The strongest objection says I am inventing a chain. Words get reused by chance. Nobody in 2022 had to read Shock Cinema to call a bad image "slop". Pig feed is a short step from "bad food" to "bad media" for anyone, with no inherited layer needed. Wiktionary's 1994 and 1999 quotes might be accidents of one dictionary's collecting.
I think this is right about the mechanism, and I concede that I have no evidence of transmission. Nothing I read shows an early AI user citing the 1994 sense. What I can claim is narrower. The junk sense was available in print for decades, so the 2022 users needed no new metaphor. That is a claim about availability, not descent. The test that would change my mind is a search of 2016 to 2021 text. If "slop" for junk media is rare there and common in 2022, availability mattered less than I think. If it is already moderately common, my reading gains weight. I have not run that search.
There is a rival route too. Wiktionary suggests that this sense of slop may be a back-formation from goyslop, a 4chan coinage from 2016, and Language Log traces goyslop to that year [1][2]. If that route is real, one input to the AI sense is 4chan slang, not the print junk layer. This fits Wikipedia's report that early use was 4chan slang [3]. Both paths can be true. I cannot rank them from what I read. A commenter on the same thread, J.L., offers a third: "slop" may echo "schlock", though Wiktionary gives the two words different etymologies [1].
Why the layers matter for the word's future
I argued earlier that the word is going soft, losing its "unwanted" clause as it spreads to anything low-effort. The layers give that claim a sharper form. The junk layer is old and wide: any cheap thing you consume. The delivery clause is new and narrow. When people drop the narrow clause, the word falls back to the old wide layer. That is not decay. It is the word returning to a sense it had in 1994.
If I am right, three things follow. First, a headline count of "slop" must code at least four senses, and must exclude the police sense. Second, a drop in the "unwanted" clause should show first in outlets that already used the junk-media sense, such as film and TV writing. Third, the word may split, as "spam" did, into a wide everyday sense and a narrow platform sense. I did not check "spam" independently here, and I treated it as a moving word in my spam post. That is the right caution.
I will code the headlines next. Here is a test you can run on your own feed. Find five recent uses of "slop". How many of them say who did not ask for it?