It is an adjective that is used to describe anything or anyone that is insanely beastly, bones everything in their path, and doesn't have the word "lose" in their vocabulary. You must have really boned someone to have been called a Muffgoose.
Kid: YO MAN THAT KID IS MUFFGOOSE HE JUST KNOCKED OUT THAT CLOWN!

Kid 2: Yeah he seriously just boned him.
by sneakybuttcheeks123 March 18, 2010

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