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1.
The fat lead singer of the alternative rock band, Kill Hannah, Mat Devine. Also a very bad insult for somebody of the overweight/obese class.
"You stupid matass, you're fatter than that singer of the greatest band of all time!"
<br>"Gerard Way?"
<br>"Mat Devine!"
by Fayth. February 09, 2008
 
2.
A fatass named mat; morbidly obese
Wow, look at that matass.
by Mrs. Bilz August 30, 2007