Top Definition
A derogatrive term for a small furry moustache, usually found between the upper lip and the nostrils.
Derived from the reference to a rodent on the upper lip.
"Yo my man! Look at that guy with the mousetache! He clearly ain't hip to facial hair styles like we are."
"Stop trying to be cool Ben, you don't speak like that normally and you just made up that term. Just face it, you cannot start a meme."
"Such a buster..."
by Ben the Elder May 17, 2008
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