A person who goes on a straight date despite being flamingly homosexual. (This is typically but not exclusively used to describe a situation where the couple met online i.e. Tinder)
My friend Melissa went on this date with a guy from Tinder, and the moment he opened his mouth and called his female friend a queen…she knew he was a rainbow trout.
by Darkraiguy July 3, 2022

by Whigger164 August 3, 2016

This chick had me over last night and really had me eat the rainbow. I never had so many vegetables.
by FNBG December 5, 2021

A term for when you think someone is LGBTQIA+ but are uncertain about what they are. Variation of on the spectrum but intended to be cheeky rather than impolite.
Tyler Perry is definitely on the rainbow.
or
“Does my mullet, beer belly, croc sandals, septum ring, covid mask, and bandana make me look like I’m on the rainbow?” “Yeah, totally.”
or
“Does my mullet, beer belly, croc sandals, septum ring, covid mask, and bandana make me look like I’m on the rainbow?” “Yeah, totally.”
by Barbara Streisand June 19, 2025

Bravis: Since we can’t call them f*gs anymore, I’ll make a new slur
Selden: What
Bravis: Rainbow Wanker
Selden: Let’s add it to Urban Dictionary!
Selden: What
Bravis: Rainbow Wanker
Selden: Let’s add it to Urban Dictionary!
by dickcockandballs April 13, 2023

by FuckUpInTheSky July 5, 2016
