When two people cut there thumb and press the open cuts together forming a blood pact.Considered by some to be like becoming family.

"I say Becoming blood brothers is a good way to share HIV"
by Hymen June 20, 2006
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Only the most kick ass band on the planet! Has released 6 albums so far, including March On Electric Children (2002), This Adultery Is Ripe (2002), Burn Piano Island, Burn (2003), Rumors Laid Waste (EP) (2003), Crimes (2004), Love Rhymes With Hideous Car Wreck (2005), and their latest, Young Machetes (2006). Young Machetes was produced by Guy Piciotto of Fugazi and John Goodmanson who also co-produced Crimes along with the band themselves.

Members of the band include: Johnny Whitney (keyboard + vocals), Mark Gajadhar (drums), Cody Votolato (guitar), Morgan Henderson (bass), and Jordan Blilie (vocals). They officially formed in 1997 in Seattle. Jordan Blilie is brother to Hannah Blilie, the drummer for Olympia-based band the Gossip.
Side projects of some band members include Head Wound City, Neon Blonde, and Waxwing.

Their sound could probably be placed somewhere within the range of
experimental punk, soaked in angst and a heavy scowl towards mainstream culture. Johnny Whitney's infamous high-pitched screams resonate throughout all of their albums, a memorable feature.

In all senses of the words, fucking sweet!
"Dude, are you going to that Blood Brothers concert tonight?"
"Hell yes, the Blood Brothers are fucking sweet!"
by poeiscool November 18, 2006
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1.Someone you would die for
2.Blood members
My homie Brian has known me since we were 10 and now we both are 14. We would die for each other.

Brian: Blood Brothers
Andrew: We'll be blood brothers for life
by Andrew Gonzalez January 3, 2008
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The (hopeful) coincidence of two friends copulating with the same girl who was on "the bloob" during both occasions. These friends now have the unbreakable bond of being Blood Brothers.
Blood Brother status is normally realised during a chilled game of Never Have I Ever.
Blood Brothers
by Banjo 3 times February 11, 2010
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someone who became your brother through sharing blood. ***required to get a tramp stamp of their blood sister.***
those two are blood brother and sister

how do you know?

look, he has a tramp stamp of her name.
by downwithsatan6666666 March 30, 2010
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To further escalate your friendship with a male counterpart and become related; in order to do this you must be in the same orifice as your friend at the exact same time . Also know as a train! Chu-Chu Motherfucker. I REPEAT THIS IS THE ONLY WAY TO BECOME KIN.
Bro are you wanna be my blood brother?!
Friend: I thought we already were!
Naw you're my best friend but to be my blood brother we gotta run a train together!
by bashy flashy cashy July 21, 2020
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When a guy dances with a girl who is having her period and the blood leaks through and gets onto the guys jeans. This blood stained fellow is now blood brothers with the girls current boyfriend.
"Ah fuck, well I guess this makes use blood brothers now."
by Mr. Nuguuyen November 29, 2007
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