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1.
A person who is batshit crazy is certifiably nuts. The phrase has origins in the old fashioned term "bats in the belfry." Old churches had a structure at the top called a belfry, which housed the bells. Bats are extremely sensitive to sound and would never inhabit a belfry of an active church where the bell was rung frequently. Occasionally, when a church was abandoned and many years passed without the bell being rung, bats would eventually come and inhabit the belfry. So, when somebody said that an individual had "bats in the belfry" it meant that there was "nothing going on upstairs" (as in that person's brain). To be BATSHIT CRAZY is to take this even a step further. A person who is batshit crazy is so nuts that not only is their belfry full of bats, but so many bats have been there for so long that the belfry is coated in batshit. Hence, the craziest of crazy people are BATSHIT CRAZY.
Dude that guy on the corner wears a tinfoil hat and ripped all the wires out of his house so the government couldn't listen to his thoughts.

Really?

Yeah, he's batshit crazy.
by KBLI August 19, 2009
 
2.
1. A synonym for Tom Cruise.
Tom Cruise is batshit crazy.
by Robert O'Fredreck-Llewellyn March 02, 2008
 
3.
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 30, 2006
 
4.
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 02, 2005
 
5.
adj. speech or behavior that is over the top, unhinged, self-destructive, or a threat to others.

Condition may be temporary (e.g. "Dad went all batshit crazy on me when he saw the cell phone bill") or prolonged ("Adolph Hitler was a batshit crazy megalomaniac responsible for the deaths of millions in 20th-century Europe.")

see batshit, batshit fucking insane
Did you see what Maureen wrote last week? Girl's been batshit crazy ever since Michael dumped her.
by Jim Wright August 08, 2006
 
6.
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
 
7.
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 11, 2004