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1.
someone who is very hairy on their face and looks like a muff!And is also just genrally ugly.
get away from me u muffmonster

omg get a shave
 
2.
a more laid back term for female pubic lice
"holly's been to the doctors..."
"has she?"
"yea she thinks she's contracted muff monsters"
by x_Katy_x May 16, 2006