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1.
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
von Big Man 19. Februar 2004
80 49
 
2.
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!
von tim171 23. Oktober 2008
15 5
 
3.
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
von nickyflo 28. März 2009
2 7
 
4.
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.
von T-Roc86 18. Dezember 2009
2 9