Top Definition
Sticky residue, also know as semen, left above the upper lip of the person who just gave a blow job. The semen dries to give the appearance of a white mustache. Got cum?
The fuckin’ cumstache I left on Miss Stewart made the bitch look like Santa Clause in a snow storm, ho ho ho, bitch!
von Pimp Daddy Chad 3. Mai 2003

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A mustache of semen (cum) that is delacately layed on the upper lip of a female, or in a homosexuals case on the upper lip of a man. This can be licked off by any partner and deposited into a sink or swallowed. Make sure there are no STD's while preforming this sexual activity. Best done after oral sex.
Dude i was gettin head from this chick and i cumed on her face and made a cumstache outta it... it was gnarly. it was a true work of art! She swallowed it and everything!
von Alex Ostrow 18. April 2006

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After the act of oral sex, on occasion the partner's cum is left behind on the upper lip, under the nose. This can resemble a mustache and commonly confused as a milk mustache.
John gave the ho a fancy handle-bar cumstache, paid for her fine services and departed ways.
von Knifo 23. August 2011

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A mustache of cum after one tries to swallow.
"Man she blew me and got a big ol' cumstache!"
von JCbaybee 26. März 2010

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residue from oral sex around your lips.
I got grossed out i saw an old man with a cumstache
von matt + ed 4. März 2004

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when a girl gets cum above her lip under her nose, like a mustache
that girl got a cumstache in this porn i saw today!
von mmaaaxxxxxxxxxxx 18. Januar 2008

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