look up any word, like thot:
 
1.
a woman performs fellatio on a man and keeps his 'juices' in her mouth, then the man performs cunnilingus on the woman, whilst she is menstruating, and also keeps her 'juices' in his mouth, they then kiss passionately making one big assed sloppery rank-as-fuck mess.
couple: slop, gargle
me: wretch

(to be honest i wretched at the description)
by el March 16, 2005
 
2.
Cunnilingus performed while a woman is menstruating.
Mike likes to rainbow kiss Lauren.
by Odovaucer November 17, 2003
 
3.
when a guy puts period juce from a menstruating girl and makes out with her wtih th juice still in his mouth
Tim likes to rainbow kiss with his bitch
by homerice69 March 02, 2005