A rainbow kiss is a sexual activity where a female who is on her period sucks a mans penis and keeps his cum in her mouth. The man continues to go down on her and keep the blood and cum in his mouth, then they kiss while mixing the fluid in eachothers mouths.
Girl: John lets do a rainbow kiss.
Boy: Oh okay
by Jack the stocking May 1, 2021
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A man goes down on a girl during her period, Blood goes into the guys mouth.

The girl then goes down on the guy, the guy cums in her mouth.

They kiss and exchange blood and cum while doing so.
"Do you want to try 'Rainbow Kissing' tonight?"
by Meaner Define February 29, 2020
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When a guy gives a girl head while she’s on her period
Mark gave Jenna a rainbow kiss on her birthday
by AHowell123 November 30, 2020
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When someone gives head to a guy, he cums in her mouth and when a boy gives head to a girl during her period he gets blood in his mouth :D
by urmomisyourmom January 22, 2022
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When a girl has her period, a guy eats her out and holds the blood in his mouth, while the girl sucks the guys penis and holds the cum in her mouth.
Bro ngl i'd rainbow kiss my bf and make out after dawg XD
by briswife September 27, 2023
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how to test: get some mayonnaise and ketchup and mix them up together
real: girl has a period and they make out until he masturbates and gives her head and the blood from her period gets into her mouth and idk
BF: "Hey girl, wanna rainbow kiss while my parents aren't home ;)"
GF: "*mind* Huh?"
by programmerista December 26, 2022
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When a group of girls want to go home with a boy every girl gotta have a lipstick that is different from each other and the girl who go the deepest goes home with the boy
by Jus de fiak March 14, 2022
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