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When you aim your ass up in the air & shoot diarreah onto someones face
My friend passed out on the couch so I gave him a dirty rainbow
by Big Man February 19, 2004
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1. The act of puking, pissing, shitting, and cumming all over a person as an act of humiliation, thus creating a disgusting rainbow of different colored substances.

2. When one has so poor of a fashion sense that you can only describe what they're wearing as a "dirty rainbow."
1. I heard Alec gave your mom a dirty rainbow last night when she was passed out.

2. Did you see what Alec wore to the dance last night? He looked like a dirty rainbow!
by tim171 October 23, 2008
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When you shit across the bottom of someone's windshield, so that when they turn on their windshield wipers, a glorious rainbow of shit is painted behind the wipers.
Pat: Hey why does John look so pissed all of a sudden?
Sam: Oh I gave him a dirty rainbow
Pat: Wow that's so wizard
via giphy
by FriedGreenEggs February 12, 2017
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The act of sticking you whole hand up someones asshole, then pulling it out and smearing it on them, openhanded, in a semi-circle pattern to resemble a rainbow. Similar to a dirty sanchez, but this is much bigger and can be done on other parts of the body.
Hey man, I just gave your sister a dirty rainbow.... Then I shot her my pot of gold.
by T-Roc86 December 18, 2009
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when you are standing above a girl who is lying down and you blow ur load in her face while shitting on her tummy
Yo i just dirty rainbowd that girl
by nickyflo March 28, 2009
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