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Royal Rainbow 

To throw up profusely, normally in the figurative sense. Usually in response to something that is too cute or just outrageous for words. Done in the fashion of the King of Cosmos from Katamari Damacy in which the person emits a large rainbow from the mouth that has pink instead of indigo for some reason.
My girlfriend is so cute, she makes me want to Royal Rainbow whenever I see her. It must be love.
Royal Rainbow by Baby S. Doll January 1, 2009

Taste the Rainbow

I have Skittles in my mouth. Do you want to Taste the Rainbow?

Black Rainbow 

A freshly caught rainbow trout used as a vibrator.
Man, I met this girl who wanted some kinky sex, so I gave her the Black Rainbow.

That prostitute only charged $20 more for letting me give her the Black Rainbow.
Black Rainbow by Just Wrong May 7, 2009

black and white rainbow 

When someone is unable to perceive the beauty that is right in front of them.
Unable to wake herself from her compulsive workaholism, she was stuck staring at a black and white rainbow.

Shit rainbow 

The shit rainbow:
Purple: putrid gameplay
Blue: bad music quality
Green; Graphical farts and garlic
yellow; Piss poor keeping the source
Orange: Orange you a fucking idiot
Red: horrible rage educing masochism
-The Angry Video Game Nerd

Gravy Rainbow 

When you shoot diarrhea, in a rainbow-like arc, onto your partners chest.
I was going to fart on my wife, but totally shot her with a gravy rainbow.
Gravy Rainbow by Go Badgers May 17, 2011