The small stretch of skin between a males anus and his ball sack.
"There is a place between your crack and your sack called your biffen, that's the place you don't want to be a sniffin'.
by Stano October 19, 2013
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Biffen is some sort of a game. To start you put a sausage into you partners anus. After this your partner tries to shoot the sausage in your own mouth by contractions of the circus muscles of the anus.

This game involves a lot of practice and tactics.
Last night Maria and I went biffen. She shot it three times in a row into my mouth. She is really an expert!!
by Circular_muscle_destroyer November 5, 2019
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