Typically used with some variation of "I want to". Used to describe a state of sexual attraction to a particular female. Possible reference to how some porn stars will use spit as a lubricant during anal sex.
Guy 1: Damn, that chick is HOT.
Guy 2: Yeah, I'd definitely spit in her butt.
by aaaaaaaa May 16, 2006
Get the spit in her butt mug.