when girls all put on different color lipsticks such as red orange yellow green blue and purple rainbow colors and take turns giving a guy head so it looks like a rainbow on his dick
Billy almost got a rainbow kiss last night from that group of girls.
by anonoymous May 14, 2004
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the act in which two participants (typically of opposite genders) perform oral sex on each other during the female's menstrual cycle and then make out in an attempt to combine the sperm and blood together.
John: would you be up for a rainbow kiss?

Karen: let's do this!
by lint noodle December 23, 2020
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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 30, 2008
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When a female is on her period and the guy shoots sperm onto the blood, licks it up, then kisses her.
I rainbow kissed your mom, and she loved it.
by Jello March 16, 2005
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wen you lick and suck a girl's pussy and you get all her blood in your mouth and the girl sucks your cum
i licked a girls pussy and the blood dripped down me while she bent down to suck my dick and drink my cum
by blink 182 fan May 6, 2003
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rainbow kiss is a part of nature
kissing a girls fanny wen shes on her periods and getting blood allover
by Anonymous October 28, 2003
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To put different bodily fluids such as semen and a girl's period into a glass (or not) and drink it
Mmm, that rainbow kiss tasted musky!
by Matt August 14, 2003
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