There are a couple issues with that definition:
- quality is not always correlated with "cheaply made en-masse"
- actual slop, assuming you are talking about the food, is more about preventing food waste although it happens to also be cheap.
I'm being pedantic AF because most people refer to AI slop as "low-quality or careless work". And AI is just a tool so it's possible to spend a lot of time making something of high quality with it. I get the outrage with respect to copyright and artist rights, but it certainly doesn't look like slop to me.
Eeeeh your definition is as good as mine. To me, slop is used to convey the fact that whatever it is applied to was made with quantity/efficiency in mind rather than quality/purpose, like what is fed to pigs. Indeed, ultimately slop could be good by that definition. Lots of people like McDonald's, but I think most people also realize it is slop.