Ass Frosting 

(1) When having anal sex, you pull out and cum on her butt.

(2) A very stupid person's behavior

(1) "Things were feeling so good, I gave her a little ass frosting"

(2) "Get off of me with your ass frosting!"

Ass Frosting by J.T. in KS January 13, 2009

ass frosting 

Doing a line of coke off a hooker's ass.

Damn, man, for only $30 bucks I could get a little ass frosting from her.

ass frosting by biocat89 December 14, 2010