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When a male ejaculates onto their partner's face (generally after oral sex) and the semen lands largely on the upper lip. The ejaculatee then puts on a sombrero and yells "Dios mio!" and restrains their partner until the semen dries, creating a queso mustache.
Last night, my wife ended up with a textbook queso mustache after a blowjob.
by atleastjake December 20, 2015
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