bumsac

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 18, 2007

bumsac

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