Slang term to describe a person who has gone crazy, often to describe a tweaker.
My friend was tweaking and then he went bat-shit crazy and started talking to the walls about pink elephants.
by Bottom Twink January 22, 2016
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1) Behavior consistent with a person who exhibits the characteristics of a complete moron/noob/nub/tool, it’s commonly used in mmo’s to describe noobish like behavior.

2)Also see "total douschenozzle"
While jacking in a Mara central, a bat shit retarded merv tried to gank me but he was quickly thwarted. What a skatmuncher!
by Chris August 22, 2005
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When crazy as a run over dog just wont suffice.
Bitch - "I'm skanky, your a bad influence"
Bro - "Dude, that ho is bat shit insane"
Bro- "I know, right?"
by AUChode August 7, 2008
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1. Like the Bat Signal, but used to summon someone crazy.
"Hey look, there's Gary Busey. Someone must have turned on the Bat Shit Signal."

bat shit crazy bat shit insane
by Jack117 June 13, 2010
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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 17, 2009
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