a urban game where the loser of some contest (Basketball's 21 game or a one on one game) must bend over to expose his ass and accept getting hit in the ass by some object. usually a basketball
You lost man now give up the boonks.
My game- boonks up man.
Take your boonks like a man.
A literal ass-kicking, usu. the stakes in a wager. "Playing for boonks" denotes that the loser of the contest gets a kick in the ass from the winner.
"My ass was real sore from balling with MJ for boonks all day long"