Glossary · noun
AI slop
AI slop is content produced with generative AI that is low in quality or unwanted, and typically made at volume with little human effort or review. Merriam-Webster, which selected “slop” as its 2025 Word of the Year, defines it as “digital content of low quality that is produced usually in quantity by means of artificial intelligence.”
In plain English
There is no single agreed definition. Academic and policy writing on the subject says so repeatedly, and treats the term as a family resemblance rather than a category with sharp borders.
For the full treatment of the concept, including the live arguments about where its edges sit, see What is AI slop?.
What the definition is trying to capture
Three ideas do most of the work in the literature:
- It looks finished but is not. AI slop is fluently written, competently laid out, photorealistic. The surface is convincing and the substance is missing. Researchers writing in the ACM describe this as superficial competence.
- The effort is lopsided. It takes far less effort to produce than the equivalent human work would, and it shifts the cost of checking onto whoever receives it.
- It is built for volume. Slop is made in bulk by design and distributed through systems that reward quantity, which is why it concentrates in feeds, retail catalogs and search results.
Where the edges get contested
- Does it need to be AI-generated? Most definitions require generative AI. Everyone agrees there was slop before AI, and that people write sloppily without any model's help. The term as used today points at machine-generated material specifically.
- Does it need to be mass-produced? Some definitions require volume. Legal scholars have argued the opposite: that a single unreviewed AI output can be corrosive, and that the volume framing lets the smaller cases off the hook.
- Is it a description or an insult? Both, and that is the interesting part. “Slop” carries a verdict. Writing in npj Artificial Intelligence, one philosopher argues the word smuggles in a judgment about the technology rather than about the specific piece of content, which is why arguments about slop slide so easily into arguments about AI in general.
Why the word still works
Because it names a real experience in one syllable. Before it, English had no short way to say “machine-generated material that nobody checked and somebody pushed at me.” The nearest predecessor was “spam”, which describes unwanted bulk email and nothing about the way an AI image can be beautiful, plausible and completely hollow at the same time.
Origin and history
“Slop” is an old word. It meant soft mud in the 1700s, and later came to mean food waste or something of little value, which is the sense animal feed still uses.
The AI sense emerged in the early 2020s. Commentary on the term traces its early use to the release of AI image generators in 2022, where it circulated as in-group slang among communities on 4chan, Hacker News and YouTube.
It became a term of art on 7 May 2024, when the writer and technologist known as deepfates observed that the word was arriving in the language the way “spam” had, as the name for unwanted AI-generated content. Simon Willison amplified it the next day on his blog, in a post titled “Slop is the new name for unwanted AI-generated content”, and drew the analogy that stuck: plenty of promotional email is legitimate and plenty of machine output is fine, while material generated mindlessly and thrust upon someone who did not ask for it is exactly what the word names.
Institutional recognition followed. Merriam-Webster selected “slop” as its 2025 Word of the Year, announced on 15 December 2025, defining it as digital content of low quality produced usually in quantity by means of artificial intelligence. The American Dialect Society reached the same verdict for the same year. The publisher's editors framed the choice as a shift away from fear and toward mockery, noting that a single four-letter word had captured a year of talking cats and off-kilter advertising.
Examples
- An AI-generated image of an impossible scene, such as a mouse singing into a microphone, posted to farm reactions.
- A book on a retail listing generated from public information and published without anyone checking whether the advice is safe.
- A search or assistant response that states something false with full confidence, such as recommending a non-toxic glue to keep cheese from sliding off pizza.
- A streaming catalog description, poster or plot summary generated by a model and pushed live without review.
- A workplace memo or report produced by a model in minutes and forwarded to colleagues who spend far longer working out whether any of it is usable.
Also known as
- slop
- AI-generated slop
- slop content
Sources
Every factual claim on this page is traceable to one of these. Where a number or quotation comes from a single source, it is attributed in the sentence that uses it.
- AI slop Wikipedia
- 2025 Word of the Year: Slop Merriam-Webster
- Slop is the new name for unwanted AI-generated content Simon Willison, 8 May 2024
- A quote from @deepfates Simon Willison, 7 May 2024
- Why Slop Matters Kommers et al., ACM
- AI Slop: Definitions and Normative Status MINT Lab
- Measuring AI “Slop” in Text arXiv 2509.19163
- AI Slop and the Information Ecosystem Columbia IGP report, March 2026
- “AI slop” hides the conversations we should be having npj Artificial Intelligence
- AI Slop (Draft) Boston University School of Law
Frequently asked questions
What is AI slop in simple terms?
Content produced by generative AI that is low quality or unwanted, usually made in bulk with little human review. The key idea is careless production pushed at people who did not ask for it.
Who came up with the term AI slop?
It emerged from developer and forum slang after AI image generators arrived in 2022. The writer deepfates gave it its definition in May 2024 and Simon Willison popularised it with the spam analogy the next day.
Is AI slop the same thing as AI-generated content?
No. AI-generated content is a description of how something was made and carries no judgment. AI slop is a judgment: low quality, low effort, unwanted, and usually produced at scale.
Is AI slop illegal?
Producing slop is not a category of offence. Specific uses can break the law, for example where content defames someone, infringes copyright, deceives consumers, or spreads fraudulent claims. The word itself describes a quality and effort judgment.
Can AI slop be detected automatically?
Not reliably. Researchers who built taxonomies for measuring slop in text concluded that fully automated, scalable measurement remains an open problem, and that people often disagree on borderline cases.