One that goes down on a female while she is on her period.
That nasty little rainbow kisser needs to wipe his mouth.
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When a man ejaculates into his partner's asshole, then sucks it out, and proceeds to make-out with their partner.
I heard Dirty Rainbow Kissers are very popular at homosexual bars.
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Someone who find zoro, luffy, or just any one piece man attractive.
“You little rainbow kisser!”