When you have sex, when the gurl iz on her period. Both partners suck the gurls blood and the boys cum into their mouths, and then they french kiss then swallow the remenants.
Katy : Me and Jim performed a rainbow kiss last night!
Jill : Did the cum taste nasty?
by Lupe Fiasco April 22, 2006
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When a girl os on her period and the guy sucks her pussy and the girl sucks his cum and they exchange in a kiss....
U gave Sheran a rainbow kiss last night...heavy and colorful ...
by Danienellie August 11, 2006
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lickin out a gal while they are on their period, so theat u get blud in ur mouth then u kiss the gal and pass over the blood!!!!!!!!
matthew hull licked out sian and got more then he bargined for so he shared the love/blood!
by el tit face August 19, 2003
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When you eat out an Irish girl, and she forgets that shes menstruating.
When I ate out Aishling's twt before sexxxxx, my mouth got full of blood. I hope I forget this by 2mm. Rainbow Kiss!
by Eyerish November 29, 2006
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When you kiss someone while wearing rainbow lipstick, leaving a beautiful rainbow kiss mark on their face.
She gave him a rainbow kiss.
by Eternities22 July 14, 2016
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when you go down on a girl during her period
girl a 's'pose nothing happened last night cos it's that time of month'

girl b ' actually he gave me a rainbow kiss'

girl a 'never had a guy game enough to do that to me b4'
by lantern January 23, 2007
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