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1.
Its an expression you use when you want or needs something more than just bad.
Hey man call me back cause i need some trees mad bad!
by Tdowns June 08, 2007
 
2.
Pertaining to a display of just utter badness.
"You just madbad"
"Dude, that movie was madbad."
"You just mad cause you bad."
by Dave Boulet January 11, 2009
 
3.
A term used to describle catastrophic outcome.
Dude, I just got into a car wreck, it was mad bad!
by Douggivesgoodhugs April 15, 2011