adj. (slang): A combined state of mental agitation and physical volatility. It's use may provide warning that the individual it describes has lost all self-control and cannot be reasoned with. Can refer to either a chronic or temporary condition.
I wouldn't go in there if I were you, Dolores is bat-shit crazy .

by maximo hudson January 20, 2009
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A person who is both Jewish and batshit crazy. May also apply to events and objects.
Jimmy is totally Shabbat shit crazy.
by Kramaus July 26, 2019
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A clinically insane person beyond the regular diagnosis given to them by a psychiatrist.
Family: "So, did he have a psychotic break? Or is he manic/depressive?"
Doctor: "No. I'm sorry. Your son is bat shit crazy."
by Brainiac March 2, 2005
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The inordinately unhealthy addiction of app browsing and purchasing by apple addicts.
John: Where's Bob?

Nick: He's been locked in his room ever since the I-pad came out. He's been browsing through the app store like a crack addict.

John: damn, he's really gone app shit crazy
by Oruhito June 22, 2010
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Acting in a generally insane manner; Tom Cruise.
When Tom Cruise jumped on Oprah's couch, he proved he was bat-shit crazy.
by Lorraine Bates July 31, 2006
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Crazy to a degree bordering on complete insanity. The state in which one makes decisions which make the exact opposite of sense.

See also: bat-shit
Why did Erin cheat on you with that greaseball?
- Because she's bat-shit crazy.
by DJ Bitterbarn August 12, 2004
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One step beyond just plain crazy. It is usually a temporary thing...sparked by something unexpected, or just really awful.
As soon as he saw me humping his mom, he went bat-shit crazy.
by ithaqua April 13, 2003
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