Definitions by Lupe Fiasco

rainbow kiss 

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?

rainbow kiss by Lupe Fiasco May 4, 2006