Pissing, shitting, throwing up, having a bloody nose, and crying. All at the same time.
We were doing the All American Challenge and I started biffing and my team won!
by Dylanomgwtfbbq April 7, 2008
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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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