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
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from firstname.lastname@example.org. We'll never spam you.×