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.
by Mr. Nuguuyen December 28, 2007

a guy who goes about making little children smile throughout the galaxy. He's a friendly character, and has a heart of gold. It is rumored that during every Christmas, he gives away abundances of polish sausages and ham to all the hungry children of the world.
by Jon P August 30, 2005

Dude, you won’t believe it, I slept with Alexis last night. It was great but I think she was on her period. Same thing happened with Jeremy last month, that makes us Eskimo Blood Brothers.
by Vulpix May 30, 2021

A secret kept between two friends of any gender. The difference between a regular secret and a blood brother's secret is that a B.B.S is taken to the grave with both people.
Person 1: Hey, don't tell my girlfriend about what happened last night
Person 2: Sure thing, blood brother's secret.
Person 2: Sure thing, blood brother's secret.
by giraffe112 November 9, 2015

by Penguy1738 November 28, 2016

by Lilron325 December 6, 2017

When two or more guys fuck the same female during that time of the month or
The term for the collection of men who have shared the same bloodly vagina
The term for the collection of men who have shared the same bloodly vagina
by Meekis36 November 10, 2020
