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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 08, 2010
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2
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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3
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
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4
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
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5
A group of male friends who share the same passion for catching rainbow trout.
Went out and had an awesome day fishing with my rainbros
by Yawbow fisherman February 12, 2017
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6
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 August 20, 2016
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