Air-Butt-Guitar
the sexual process of placing ones hand in anothers butt extending the fingers, and wiggling them around as if one were playing the air guitar.
i totally banged this girl last night and played favorite air-butt-guitar riffs.
air butt guitar
the insertion of your hand into the anus of your partner and proceeding the wiggle your fingers inside while strumming the air guitar with your other hand.
so i was hanging out with the chick last night listening to Led Zepplin and she totally let me play air butt guitar to "Kashmir"