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1.
an annoying little shit who shows off and agitates and always stirs up shit.

A person who is always annoying and irritating, they constantly aggravate you to the point of of giving them an ultimate beatdown.
ethan is a lil rat.
im gunna giv that lil rat a pasting!
how annoyin is that lil rat?
by Nick and James July 16, 2006
8 1
 
2.
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
1 0