Top definition
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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2
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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Donkey Punch Plush

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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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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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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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Dirty Sanchez Plush

It does not matter how you do it. It's a Fecal Mustache.

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5
Sista 1 says: That man is FINE!
Sista 2: Girl, redirect. He a rainbro.
by LLLLLLLAM January 02, 2010
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Soft and offensive. Just like you.

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6
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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Donkey Punch Plush

10" high plush doll.

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7
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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