When a male dog's penis unsheathes, it resembles the action of someone twisting red lipstick, also because a dog's penis is red.
Dude #1: Your dog totally unsheathed on me when I pet him!

Dude #2: Well, he wanted to give you his red lipstick!
by poophed October 12, 2013
when a guy goes down on a girl on her period then he comes up and kisses her and her blood is on her lips
wow dude, i cant believe you did a red lipstick
by Devin Willoughby August 02, 2008
Red lipstick. A term used instead of French kissing, kissing or making out. Also known as first base.
Me: 'Have you seen my red lipstick?'

Friend: 'Omg you lost your red lipstick? Who did you kiss?'
by Blackbirdie September 12, 2014
A form of oral sex red lipstick is when one participant gives oral sex to a female during her menstrual cycle allowing the blood to gather on their lips and upon finishing kisses that female.
"Dude, I gave Becky red lipstick the other day."
by Devin989 July 29, 2008

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