Usually when people, mostly girls, are in the mist of fight. And one of the girls is like "B.I.O. (Bring It On)!" Don't piss off that girl right there! She will lash out.
Stacy: "B.I.O. BITCH! Don't mess with me!"
Jean: "HA! Try me!"
by SURFTIME9 June 13, 2011

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Bio
An annoying way to say you're going to the bathroom, often used in WoW but has been used less frequently over the years (thankfully)
Gaydude123: Brb bio
Gayguy321: Dude just say you have to take a shit
by GM8 October 03, 2010

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Biologically Intense Odor

An odor secreted by an organism that smells so bad it might get you light headed,might be armpits,feet,sweat,etc..
His feet smelt so bad that I got dizzy while just passing him,he's got some B.I.O
by Engo May 31, 2014

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bio
A polite way of saying that you're going to the bath room.
Stands for Be In the "Office".
Guy one: "Hey man I just ate a ton of Mexican food, BIO break."
Guy two: "Dude, nasty..."
by Capt Anarchy May 05, 2009

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slang for cocaine.
angel: hey dude what'd you do today?
warren: bios
angel: wtf dude, how much did you grab?
warren: half g
angel: sick
by OfficialTripz April 04, 2010

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bio
Abbreviation of biodiesel.
My Benz runs on bio.
by jahmiller October 19, 2010

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The Urban Dictionary T-Shirt

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BIO
BIO is an acronym of the phrase BITCH ITS ON!

it can also be substituted for bring it on but is slightly less effective.
girl1: i bet guys like me more than they like you!

girl2: BIO!
by twentyone31 March 05, 2010

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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