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A vat that is full of cum; to wit, a slut who's had a lot of pricks in her.

See: wordhilary duff/word
That wordhilary duff/word is such a cumvat
by Spatvark October 31, 2003
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2
a girl that you come on just becouse she'll let you.
you fucked that girl at the bowling ally? she's a fucking cumvat!
by Big Matt. yep its me January 20, 2003
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