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when different girls each put on different color lipsticks and suck a guys dick and leavs a mark of the lipstick color on it
"yo dude i went rainbowing last night with jess, jess, lis, and kira!"
by Jess November 14, 2003
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The act of eating out a female whilst they are having their period.
Nick spent his time eating Sarah out, and when he rose Sarah noticed blood around his lips.
by Dark Kitten April 09, 2005
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The act of being homosexual or taking part in activities only an individual who is homosexual would take part in.
Sarah: "John was rainbowing so much at the party last night."

Eric: "I know. All that PDA with Ben was disgusting. We all know he's gay. He didn't need to show it."
by dghul May 29, 2009
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When a person changes lipstick several times while felating a penis, and leaves a rainbow colored hue on said penis. Ref: Jeffrey Budzynski- contemporary American, Floridian, rainbower of police penises.
Jeff changes lipstick a lot and is always rainbowing the cop's penises.
by Jeffblowscops August 01, 2018
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