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1.
To completely fuck up something despite having taken every safety precaution except for not killing your damn self for being such an idiot.
OMFG, you just mased your $100k car in that accident!
by opsman February 20, 2003
 
2.
when u get robbed by a fat chick
when you are at a party and get drunked and a fat chick takes your cd's from you then the next day u call her and ask for them and she said she wont give them to you.
by Perro June 29, 2005
 
3.
See fubar
When you put a motherboard in a case without standoffs, and then turn it on and wonder why the whole damn thing catches on fire, you have officially mased your motherboard.
by Kuja February 24, 2003