Top Definition
An insult commonly used by secondary school goers. Derived from the Latin 'Mous' meaning a mammal with antlers, and 'Nippelus' a body part that no one has get found a use of, therefore making the person it is directed at a big, hairy, useless, imaginary mammal.
Stop being such a Nipplemoose!
by Hazzyyyyy Beckyyy December 11, 2010

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