To put different bodily fluids such as semen and a girl's period into a glass (or not) and drink it
Mmm, that rainbow kiss tasted musky!
by Matt August 14, 2003
something that has never happened anywhere, ever, to anyone, at all.
"Excuse me darling, now that we have achieved maturity and entered a sexual relationship, let us perform that rainbow kiss we heard about in school."

"erm, no, I don't think we should actually."
by Clayton July 14, 2003
When a guy gives head to a girl while she is having her period, and gets all the blood in his mouth. And a girl gives a guy head, and gets cum in her mouth.

Now when the guy/girl has blood/cum in their mouth, they kiss eachother.
"Hey Melissa, say I give you head when you're having your period, and then you give me head, and then we kiss after."
by J* December 28, 2003
Indeed, the term refers to performing cunilingus on a menstruating female, often followed by orally swapping semen and blood/other secretions. NOTHING to do with homosexuals.
by duncan March 13, 2003
Basically, the guy gives the girl a mouthpiece whilst she's subscribing to the monthly rags. She simultaneously gives him head till he shoots his load in her mouth. Once they have an adequate mouthful of eachothers bodily fluids, both participants rear up their heads and enjoy the different sensations that tickles their taste buds in a passionate kiss.
As it was the only way I was ever gonna get head off that frigid bitch I had to grit my teeth, cover my eyes and boldy go where no man has gone before.
by c0za April 08, 2005
When a girl has her period, a guy eats her out and holds the blood in his mouth, while the girl sucks the guys penis and holds the cum in her mouth. When their mouthes are full they makeout and mix the fluids.
Joe and Sara gave eachother rainbow kisses.
by skejgdfjksdgf March 31, 2003
Performing 69 while a woman is on her period. The man ejaculates in the woman's mouth and the two kiss, the menstrual blood and semen mixing to form a beautiful rainbow of colour.
We shared the most beautiful rainbow kiss last night... This girl is really special.
by Cunny January 24, 2005
When a guy eats out a girl with her period then she blows him then they kiss with all of the stuff in their mouth
You guys Rainbow kissed last night, thats sick!!!
by Lexi November 25, 2003

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