I don't think that term means what you think it means....
AI is meant to be a tool like anything else. There is only "AI slop" if people themselves are HUMAN slop and just lazily use the outputs as the end product. If you see a person/company actually putting out "AI slop" then it just means that PERSON/COMPANY is slop since it means they aren't even taking time to tweak, check and validate the results they are getting. In short AI will just magnify the type of person/business/process that is using it.
If you put **** quality info/process into AI you get AI slop.
If you don't spend time to check, validate, clean up your AI results, you get AI slop.
in either case your results would have been sloppy, the AI just gets you from points A-B faster.