french kiss my ass 

Imperative sentence to command someone to kissing an open asshole using his/her tongue.

C'mon ya cocksuckin' faggot, french kiss my ass!

french kiss my ass by Prof. Dipl.-Ing. Dr. Fritz Schlong August 2, 2003

french kiss my ass 

means to kiss your ass and to stick your toung up it while doing it.
usually an insult but can be a sexual come on among gays.

you don't like it. well you can french kiss my ass.

french kiss my ass by Deep Blue 2012 August 17, 2009