A game where two guys put a drumstick up their asses and fight with them. The first to have their drum stick fall out gets it wiped under their nose.
This game was shown in the movie Dirty Sanchez.
*2 Guys play a game of bum drum*
*Guy 1 Wins!*
Guy 1: Muhahahaha, i win
*Whipes shitty drum stick under guy 2's nose*
Guy 2: Oh Shit, that's horrible
The use of your behind as a musical instrument through slapping it with your hands.
Who needs to beatbox when there is the Bum Drum!