During a girls menstration the male performs oral sex and takes a mouthful of her blood. While the male has blood in his mouth the girl performs oral sex and takes a load. They then exchange a passionate kiss with their body secretions in their mouth through a kiss
When Sean was giving a rainbow kiss, to Vanessa he got a case of the red teeth.
by Killer Joe July 12, 2006
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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.
by skejgdfjksdgf April 1, 2003
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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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When a boy/girl gives a girl a head getting all the blood in there mouth and then the girl gives the boy/girl a blowjob and gets cum in her mouth then they kiss and mix the contements
I have nothing to say 😥 a rainbow kiss
by December 24, 2020
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The act of a guy jizzing in a girls mouth and a girl getting period blood in a guys mouth, then kissing and sloshing it all together
Luke and I rainbow kissed last night... Never doing that again!
by Kingshockey66 April 8, 2014
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This is when you kiss a women after licking her out, while she's on her period. The period blood should collect in your mouth and during the kiss you pass it onto her.

NOTE: If you wanna try this be aware that you can actually catch HIV from doing this as you're swaping blood.
by Blooddiamond21 August 31, 2007
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