by bruv135 August 20, 2022

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.
Friend 2- He is. He's just an ultimate rainbro.
by Rainbro June 10, 2011

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

by Danz Ferdinand January 17, 2008

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

by test tickle August 20, 2016

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.
Dude2: Yea dude they are a bunch of rainbros.
by ErockNRoll October 31, 2009
