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
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 08, 2010
1. A homosexual bro.

2. The 2007 album by Brodeohead. A Broternative rockband from Brofordshire, England.
1. I'm going to hang out with my Rainbro, but I mean, as friends, ya know?

2. Favorite song of In Rainbros? Got to be Weird Fishes/Broppegi.
by RToffler June 03, 2010
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 15, 2008
A gay black man. A gay brother.
Sista 1 says: That man is FINE!
Sista 2: Girl, redirect. He a rainbro.
by LLLLLLLAM January 02, 2010
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 October 31, 2009

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