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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'.
Biffen by Stano October 19, 2013
Related Words
To fall on your face or in an absolutely ridiculous fashion, often suffering and being badly injured in the act.
Boy runs into a tree and breaks his leg.
"Wow, that kid totally biffed it!"
biffed it by Shelista February 2, 2009

You fat biffer 

Someone eating or aquiring comically large and/or frequent amounts of food, or appearing to do so.
Must be said with a south-west english accent (Cornwall, Devon, etc.)
Only works with the 'You' at the front, and only happens with 'You' and 'Bif' on one note, and 'fat'and 'fer' on a higher one.
There's no real emphasis anywhere, and it's deadpan despite the humourous intent.
"4 pints. And a pie."
"You fat biffer."
You fat biffer by davev July 15, 2005
To fall on your ass, like a clumsy fool
"Dude i was like grinding like nobodys business when I just biffed it"
biffed by Anonymous July 11, 2003

BiffedHawn 

The hand with which you have rubbed the head of you're unwashed penis to climax is known as the "BiffedHawn" - e.g you have Biffed yourself hand-wise, self abuse. It now has a vomit inducing scent that should be washed more thoroughly than a coughed in hand.
FFS eeeewwwwwww!!!!! whos got the biffedhawn!!?
A best friend for life. Comes from the acronym, BFFL.
Liz and Erica are totally biffels.
Biffel by Erica P. December 28, 2005