The definition of ATM is "Ass-To-Mouth!"
Guy 1: "Yo bro, did you really eat that ass out last night?"
Guy 2: "Fuck yea dude!!! We straight ATM'ed at my crib!"
Guy 2: "Fuck yea dude!!! We straight ATM'ed at my crib!"
by manwhoeatsu October 19, 2012