To screw up, wipe out, or otherwise make a mistake.
Guy #1: <falls off bike> OW! Shit, man!

Guy #2: Dude, you biffed!

by laura jane December 21, 2006
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a northen term for cigarette, but can also be used to discribe a "joint"
"lend me a biff mate?"

"shall i roll a biff?"
by loomer August 31, 2007
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v. To mess something up, specifically a physical activity.
I was coming down the mountain on my snowboard when I biffed.
by The Grammar Nazi December 3, 2001
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"When running on Woodward, Verbeek biffed pretty bad."
by Insane V April 14, 2004
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a womans naughty area aka pussy, fanny and so on
To girl: Show us ya biff!!!

Dude i slip her one in the biff last nite
by Gibb, The one and only November 12, 2006
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To lob, throw or transport an object to a location.
Gat - "Biff the grenade over there for a primo frag!"
by GatQuotes December 28, 2011
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Word of Irish Gaelic origin; an insult. Use this handy acronym to remember the meaning:

B ig
I ignorant
F at
F ucker
Man, Miguel Caron is such a biff. I hate him.
by The Zebu January 25, 2004
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