"Goyslop" and "sloppy" are both derived from "slop". "Goyslop" meaning "slop of the goy variety" (equivalently to "AI slop"), and "sloppy" meaning "having the qualities of slop".
"Goyslop" and "sloppy" are both derived from "slop". "Goyslop" meaning "slop of the goy variety" (equivalently to "AI slop"), and "sloppy" meaning "having the qualities of slop".
I was already aware of the term "goyslop" but I see it as a parallel development rather than the origin. I heard daytime TV programming being referred to as slop over twenty years ago. I don't think there are any antisemitic undertones for the word outwith the "goyslop" coinage.