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1.
The black slimey stuff on your feet from hockey skates after skating in them.
There's bumsac all over my feet
by John Fergusen August 14, 2007

Words related to bumsac

bum sac anus balls bumsack bumsak facial sack
 
2.
the space or skin between your testicals and your anus.
Sheri: wanna know what turns me on?
Bob: what, girl.
Sheri: when guys lick my bumsac
by s34d0g January 18, 2009