Top Definition
The word you say when you run your finger in between the mouth and the nose, where a moustache would grow. You do this to someone just for fun.
Josh walked up to Jesse and ran his finger by his face while saying, "Moostache."
Robert walked by Josh and ran his finger by his face while saying, "Moostache."
Josh walked by Claudia and ren his finger by her face while saying, "Moostache."
by Josh Courtoreille February 02, 2007
1 more definition
mustache that forms on one's upper lip after drinking a glass of milk.
Jenny wiped at her moostache with the back of her hand after polishing off a half a bag of Oreo's and a large cold glass of milk.
by Radishing July 30, 2012

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