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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.
rainbow by THEYWiLLNEVAHKNOW! June 10, 2005
Slang used by members of the Masonic Youth referring to either the organization, or members of the International Order of Rainbow for Girls (also Rainbow Girls)
Girl 1: I'm a Rainbow!
Girl 2: You're a what?
Girl 1: I am a member of this awesome youth group, Rainbow Girls!
Rainbow by Illuminati_princess January 14, 2015
1. Some colory thing in the sky when the suns out and it's raining

2. The act of a girl having her period in a guy's mouth and then making out with him.

3. A game played by girls where they put on different colored lipstick and make lines on the guy's penis in rings, it looks like a rainbow (note the name)
1. Look at that rainbow.

2. Last night when she was on her period, she rainbowed with him.

3. Last night those bitches rainbowed him and then afterwards his penis looked like it had gift wrap ribbons on it.
rainbow by jsmooth13 January 15, 2006
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"
Rainbow by UseYourConfusion August 5, 2009
Someone that poses as affiliated with different gangs depending on whom they are around.
Aw, he's no crip, he's a rainbow.
rainbow by sam mobo September 7, 2006
1.) A ray of light showing many different colours.
2.) Small creature which crawls up your leg and into your rectum, and then proceeds to bite the inside of it.
1.) What a beautiful bunch of colours in that Rainbow.
2.) Ow! That rainbow bit my ass again.
rainbow by Bob Dole March 26, 2003