1) the act of putting ones orifice (specifically the mouth) up against the crack of the person you love. This is usually referred to german bondage porn.
2) An alternateexplanation is usually a sarcastic put down to anyone hoping for something.
1) Q:will you kiss my ass?
A: WHY SURE HERR OBEINHOUSER i shall kiss the shit off your crack.
a fun thing to say to people when they piss you off or you dont like them anyway. Adding the 'bitch' on to the end is for emphasizing the phrase, thereforegiving it more strength and effect.
some a-hole:"Hey, Heather! Your hair looks like crap!"
Me:"Hey a-hole! Do you know what day it is? It's Kiss My Ass Day, so kiss my ass, why don't ya?"
This is a kind of canvas hat that guys wear with the brim pulled down. It is so-called because the wearer knows it looks bad; yet wears it anyway as an expression of nonchalant contempt for convention. In effect, sartorially declaring "Kiss my ass!"