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When you take advantage of a friend of either sex at a party who's drunk and willing.
Last night, my best friend and I ended up in a furff after about 5 drinks.

At that party last week I furffed Sally. She'll never talk to me again.
by WG December 22, 2003

Words related to furff

furfed fmf furf furffed
It can also mean the person that furffed. I've been hearing this more and more. Some say it stands for "F'd Up a Really Fantastic Friendship".
As in, "Gee Harold why you gotta be such a furff? You've known her since gradescool!"
by nonfurff January 16, 2004