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 March 31, 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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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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In the enlish lands of enlang a person going down on a women on her period is right also in some of the US.

But, the most recent i found out is when a guy gets a few chicks together. Each wearing a different color lip stick. Each girl trys to get the lip stick the furthest down on the guys hard penis.
John decided to get his girl and friends to rainbow kiss him.
by ShadowJester January 21, 2005
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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
by Lexi November 25, 2003
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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 07, 2014
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