[Rodney King]

We do that only when responding to certain posters who seem to have an angry hornet lodged in their sphincters concerning individuals of the Mosaic persuasion

OK, I guess. But I still don't really get it. Is there some sort of historical context?

[Cachelot]

Is there some sort of historical context?

If I remember, the term came out of some quite funny spoofs of the more frantic JewWatchers. I forget who made them. Long time ago.