by Swol Troll March 18, 2017
Similar to "inbreeding", but occurs when a bro bones down the mother of a fellow bro, usually of a bro you are very close to, that feels like a brother to you.
Your gonna poke my mom with your womb broom, aren't you Perry? That's some sick in-bro-ing shit man, please don't.
by Swol Troll March 26, 2017