frogprince -

"It's a doggie-dog world" was fairly common in juvenile slang a while back, and was sometimes used by people who do know the original expression, in some cases quite obviously to ridicule a particular person prone to the use of trite expressions, or to ricicule trite expressions in general, by deliberately "corrupting" a noxious bit of drivel in common use.

Call it a "second generation corruption."

But of course people most prone to trite and repetitius "combinations of words in lieu of though processes" do use lots of "sayings" without knowing what they say.

"Judas' Priest" of course is a way of saying "Jesus Christ" without actually saying it: a fairly common origin for "mild profanity."

John