The burning/itching feeling one gets after a wet bowel movement. Usually the effect of not wiping ones rectum well enough. other symptoms include awkward way of walking, soggy undergarments and a brownish stain on sed underpants. the only hope of ridding yourself of rainbows is using moist tissue paper to re-wipe your rectum. Symptoms will dissapate rapidly.
Mike- "Dude why do you keep scratching you butt-crack?"

Josh- "I just took a shit man, these rainbows are killin' me!"

Mike- "Dude just wipe your ass better then it'll go away."
by Proctologistno2 January 28, 2010
1. a bowlegged person (also a rude term of address)

2. a tunial (the trademarked name of the drug) capsule
Who's that rainbow at the checkout?
by The Return of Light Joker December 28, 2009
sexual slang for the simultaneous consumption of sperm and vaginal fluids by a man and a woman. Named Rainbow after the contrast in colours. term probably originated in Birmingham
"I bet them two had a rainbow last night"
by UseYourConfusion August 05, 2009
1) A symbol of happiness.

2) Something that comes after all types of rain, but not drizzle.

3) A sign that "God" is having gay sex.
1) "I'm so happy."

2) "Why isn't there a rainbow?"
"Because it just drizzled--it didn't actually rain."
"Drizzle sucks.
"Yeah, tell me about it."

3) Ask Ben for more details
by Live.Love.Learn July 31, 2009
Someone that poses as affiliated with different gangs depending on whom they are around.
Aw, he's no crip, he's a rainbow.
by sam mobo September 07, 2006
they are very random
there's a rainbow

that was random
by sexy chick.... February 09, 2010
A bunch of colors, usually 5, 6, 7, or 8. It can be bright or pastel, but it usually at least has blue, green, red, and orange (a small rainbow). A large one has blue, green, red, orange, yellow, purple, and pink.
Rainbows are colorful.
by THEYWiLLNEVAHKNOW! June 04, 2005

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