When you live in Seattle and your bro also lives in Seattle ๐Ÿ˜‚
Alec, Ali, Ben, Anton, Omar, Lakshay, Jaisav are all rainbros in Seattle
by bruv135 August 21, 2022
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A homosexual male, who still maintains all the qualities of true bro's. The best example is Neil Patrick Harris.
Friend 1- Wait, so you're saying Esteban played basketball today? I thought he was gay.

Friend 2- He is. He's just an ultimate rainbro.
by Rainbro May 16, 2011
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A group of bro's all wearing different color polo shirts.
Brian and all his friends came over last night in different colored polo's. I could practically taste the rainbro.
by Reisencach February 9, 2010
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The gay guy in the group of straight guys.
Dude 1: Is Patrick your black friend?
Dude 2: No, he's just our rainbro.
by Danz Ferdinand January 16, 2008
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When two guys cum in each other's hands, then high-five, letting the cum rain on them.
Me and my boyfriend, Joey, decided to get extreme with our relationship. We jacked off together, catching each other's cum, then high-fived while listening to Metallica. We then created the Rainbro.
by Jewlz&Woody March 12, 2020
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A straight male who supports his gay friends' lifestyle.
He's not gay, he's just supportive of his friends; a true rainbro.
by test tickle February 29, 2016
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One of the guys who is a total bro (usually on a sports team) who takes the "acting gay" thing to far and actually engages in legit homosexual activity with his fellow rainbros.
Dude1: Hey man did you see those football players touchin each other's dicks in the showers?
Dude2: Yea dude they are a bunch of rainbros.
by ErockNRoll November 1, 2009
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