I think it was just Muzs' way of say piss them in a perverted french sort of way. As far as I know it has no national origin other than my mother.

My MIL's favorite expression which we now use to mean something excessively in bad taste was "Bayersche blau und groen schieze de ganze" which supposedly meant "Bavarian blue and goose **** green" which apparently is a pretty endemic color combination in the more blatantly decorative/decorated older buildings in souther Germany.