When you fail horribly and either shit your pants during the fail or after the fail.
He totally biffed it.
Do you smell shit?
by KillTheDead May 27, 2010
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The accidental leakage of a females menstrual cycle into her panties! i.e:- blood-stained knickers as a result of a very heavy period or getting 'caught-short' without any sanitary items!
"Errrr, that lass has BIFED her pants n its come trhough her jeans! Go and lend her a tammy!!"
by KarMaCorp July 29, 2009
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(BIF = Before I forget)

...and that’s final, and that’s that, it’s as simple as that, period. BTW BIF...U suk! (It's always important to have the last word, even if it is an acronym, or as luck may have it; a pseudo-acronym.) See example below.
Kid 1: BIF...shut the F'Up. NO...Srsly!

Kid 2: (scared stiff)
by meshla December 31, 2010
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Short for borderline intellectual functioning. 1. a bif is not a "downie" but then again not smart either. 2. below average intelligence. 3. George W Bush. 4. politicians in gerneral. Often refers to individuals that wear tacky metal alloys in thier teeth.
Jay-Z just spent $100,000 dollors on a new grill yesterday, fucking BIF is wasting his money!
by nathan haley January 22, 2007
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It means you got fucked up...Real Drunk, absolutely hammered
-Yeooo I got Biffed lastnight in bloomsburg.
-Goose, your soo biffed right now
-Im so beyond biffed right now, i might go streaking
by (va)Gina, Beckles, and cole October 6, 2009
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to be happily and extremely drunk to the point where one begins saying things that don't make sense.
"Dude...I... ahh man I'm biffed."
by Captain Biffington May 12, 2009
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