To eat skittles or other flavorful candies out of a females reproductive organ.
"Dude did you give sam the rainbow last night?"
by Amanlacyaubjosh June 26, 2008
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When someone acts homosexual or just plain is. It's like calling someone a fag, but in a more discreet way.
Elizabeth: Are you friends with that kid james?
John: Him? no way, i'm pretty sure he's for the rainbow.
by Flying narwhal party October 29, 2010
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When you are hallucinating and see a huge line in the sky full of colors. Most likely because you drank way too much of that "water".
Brian- "Look! It's a rainbow!"

Amelia- "Go back to bed honey."
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Another way of saying "no homo", which is a phrase used after one inadvertently says something that sounds gay.
Keep talkin shit, and ima fuck you up. No rainbow.
by Nuggie Mel August 21, 2010
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Someone who is bi-sexual. They aren't sure if they are gay or a lesbian a not so instead of feeling like a rainbow they feel like a rainbow?
Bob: John are you gay?

John:Rainbow?

Bob:Oh i see how it is
by joeytheleo December 26, 2011
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Look! It's a rainbow!..... EWWW!!!
by anyan October 18, 2011
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