1 definition by Sason Jmitley

Top Definition
one who constantly mu's. largely characterized by the lil rat call, "mu mu mu mu mu". can be found in almost all situations "muing" someone close to them, and more than likely all lil rat's are under the influence of marijuana.
Hey lil rat stop mu'in your ass off before I later you.
by Sason Jmitley April 29, 2009
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