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15.
drunk, crazy, destructive, and bad, from NickelBack's "Burn it to the Ground"
I've got a fist full of whiskey, the bottle just bit me
Oh, that shit makes me bat shit crazy
by abra cadabrazz August 16, 2009
 
16.
Word meaning "certifiably insane" Origin comes from the fact that bat feces contain an organism called Histoplasm Capsulatum that infects the brain of any host in which it infects and causes them to act psychotic.
The guy found out the paternity test results and went batshit crazy!!!
by medic1 August 12, 2014