When a guy goes down on a girl on her period and keeps it in his mouth, then she goes down on him and keeps it in her mouth, then they kiss and mix it together (a.k.a. period blood and jism)
She's on the rag, so last night they made a rainbow.
by Mercury December 22, 2003
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.
by Bob Dole March 26, 2003
Ecstasy LSD and K. Ravers do this shit.

im takin a rainbow tonite, want anything?
by dude September 10, 2003
The line that separates gay people from straight people
Somewhere over the rainbow David Furnish and Elton John are Furnishing a John-hole
by Kung-Fu Jesus June 22, 2004
Small creature which crawls up your leg and into your rectum, and then proceeds to bite the inside of it.
AH! God Damnit! A rainbow just got me!
by adnonimape April 25, 2005
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