Earlier quoted context omitted.
4chan has been calling things "slop" for literally so long I can't remember when it started. If you go to /g/ literally right now, ctrl F slop, 4 hits just on the front page previews. If anything, it originally started as calling things "goyslop", which you might be able to deduce is a portmanteau of "goyim" and "slop", the implication (given it's 4chan) of course being that it's low-quality stuff made by Jews that i…
The regular person will never get these terms right. Most people are not aware of this game of telephone they're unwillingly being part of. It will never ceases to annoy me. I still shudder at seeing "Troll" being misused.
Actually "engineer" as well in countries where it's not protected. Though the confused look on my German housemate's face when an "engineer" turned up to connect the cable broadband cable to the property was pretty funny.