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bio hazard 

to fart on ones hand then smear it on someone elses face, preferable the nose and mouth
I gave johnny a killer bio hazard.
bio hazard by Jack Manzo September 2, 2003

biohazard 

A symbol representing a biological hazard is around, take extreme precautions to this sign, area's may be contaminated...
My tattoo is a biohazard symbol.
biohazard by Blicka January 1, 2006

Team Biohazard 

A group of Rock Band players (aka, Faggots, Trolls) who love to add horrible players to the team according to the rock band community. These horrible players include the shirtless retard, the British kid who is allergic to chocolate, the emotionless kid with the bowl shaped haircut, the Indian fag with the tiny legs, the pothead who keeps a handful of sand in his pocket, and the fat retard who makes a living off of taking pretzels off of a moving belt. Team Biohazard is also known as Team Bio, Team BioFriends, Team BioTrolls, Team DinoHazard and Team BioRacist.
YouTuber 1: Did you hear Team Biohazard got a Full Band FC of "Hey John, What's Your Name Again?"

YouTuber 2: Who cares?

Biohazard Tattoo 

Tattoo symbol with 3 interlocking circles with another circle in the middle.

The biohazard symbol was created to identify hazardous substances back in the 60's but is now part of popular culture. As a tattoo it was popularized by the band Biohazard.

It has been adopted by many in the gay and HIV+ communities to identify people with HIV/AIDS to their potential sexual partners.
That dude's got a biohazard tattoo. He's either a hardcore social reject or he has AIDS!
Biohazard Tattoo by Jaquinoff March 25, 2011

biohazard 

Resident Evil in Japan. While the name in the U.S. is Resident Evil, it's also known as Biohazard in Japan.
Dude yesterday I got Biohazard 4 for my Gamecube... man it kicks so much ass...
biohazard by RTJ1987 January 29, 2006

Biohazard 

A decent rap metal band. Sounds like a mix between PanterA and Beastie Boys.
Biohazard by [mike] June 5, 2005