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1.
A uncommonly used wrong spelling for the word 'bitch'. Usually used by gamers on crack.
Ex: "Hey bitach, you coming on the server?"
"No, you're fucking dead now, bitach!"
by troflcopter June 25, 2006
 
2.
An exclamation of either disappointment or excitement.
Bitach! Somebody just stole my car!
or
Bitach! I just found twenty bucks!
 
3.
Improper spelling variation of "bitatch".

See: bitatch
"what's up, bitach?"
"you just got owned, BITACH!"
by Sicilianmandolin February 24, 2005