Top Definition
Monsi is the G way of saying Monsieur, a french term for Sir. This is commonly used by the coolest kids in school because not only does it show their lack of interest in french, one of the lamest languages, it also shows how B.A. they are by making themselves look like a fool.
Albear: Hey do you know the muffin man?
Xavier: Oui oui Monsi.
by pwnedwithafishstick January 18, 2011

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