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15.
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
Ew you gave a rainbow kiss you nasty!!
by Lexi November 25, 2003
 
16.
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
 
17.
To have a Girl stand over your mouth while she is on her period and to bleed thru her pussy into your mouth!
I Gave Avatar_pk3r1 a Rainbow kiss and he Loved it!
by Mitchell Lockwood December 29, 2007
 
18.
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 10, 2006
 
19.
When a blokes cums in a womens mouth, while the bloke eats her pussy getting a nice mouth of blood. Then they kiss and mix the cum and blood together.........nice!
"I got a nice rainbow kiss off Sharon last night"
by The expert April 09, 2006
 
20.
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 28, 2006
 
21.
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