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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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Aug 9 Word of the Day
Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.
I think Alicia may have some real sleepers.
by KABT October 26, 2007
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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
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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4
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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5
A Rainbow brother: Someone (male) who's been met at a Rainbow gathering and feels very close.
So where did you guys meet? => He's my rainbro!
by OneWorldDestiny December 23, 2018
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6
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 11, 2020
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