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Rainbow Cheesecake 

Random girl: Eeek!
Other random girl: What?
Random girl: Rainbow cheesecake!
Other random girl: Eeek!
Rainbow Cheesecake by Megan November 7, 2004
Ecstasy LSD and K. Ravers do this shit.

im takin a rainbow tonite, want anything?
Rainbow by dude September 10, 2003
A slang term for male ejaculation.
"I totally rainbowed all over that girl last night"
rainbow by sean & nina July 29, 2005
A drink made solely from bodily fluids - semen, urine, crap etc.
rainbow by Oz March 16, 2003

rainbow wings 

a medal given to advance gay male prospective pilots to their position.
The Gay Pride Organization is pleased to announce the arrival of the Rainbow Wings.
rainbow wings by Hallie December 8, 2003

irish rainbow kiss

performing oral on your female partner while she is having "that time of the month", then proceeding to make out with her.
some may find the irish rainbow kiss disguisting, but I find it has a rather tangy taste to it.