It is the bit of skin between your scrotum and your anus. It can also be used to insult people.
You lick biffkin
or
You are a biffkinator
by Adam Stevens November 5, 2004
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male anatomy - the area of the sin between the scrotum and the rectum
by Anonymous July 11, 2003
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the space between ones legs, betwen the anus hole and the bollock sack on a man
the main area where arse hair grows.
"youve got a hairy biffkin"
by sholto bonham thomas February 27, 2004
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The hair that grows off the gooch not the gooch itself!
My biffkin is getting too long. I may need to shave it.
by Bizazy May 7, 2006
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