when you and a friend fart at the same time and the smells combine
Dylan: did we just become fart brothers?

Ty: with our powers combined, we are fart brothers!
by Fart Brothers June 24, 2017
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Two different dudes that have eaten the same ass. Somewhat similar to Eskimo brothers.
Person 1: "Bro I ate Niki's fart box the other day"

Person 2: "No way, I ate her ass last week! Does this make us Brazilian Fart Brothers?"
by Whipdad August 13, 2016
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