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A prolonged, mutually beneficial arrangement between two or more men wherein each exchanges favors with the other(s).
Bro 1: Hey man, I was hanging with that fugly bitch last night just so you could bang her hot friend. How 'bout some symbibrosis?

Bro 2: Sure man, I got your back next time we go out.
by FarmAnimal March 06, 2009
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