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14.
A sudden, seemingly reasonless burst of anger. Typically from a woman. Though a man can be the culprit, if particularly feminine. Men usually have reason for their temper tantrums.

Can consist of, but not limited to: yelling, screaming, slapping, hitting, foaming at the mouth, bewilderment, and/or diarrhea.

That last symptom can be of either the victim or the batshitter, the second to last is limited only to the victim.

Past tense is 'batshat' since 'batshitted' is just plain improper, and 'batshatted' is a double past tense.
"We were just sitting on the couch watching a movie with, all of a sudden she had an unprovoked batshit".

"Yeah mine's done that before, must've breathed wrong".

"Oh my bad".

"It's okay, it happens".
by Haydoom July 26, 2009
 
1.
A level of insanity that the word alone cannot justify. Usable as a prefix ("Batshit insane") or on its own.

Popularised by Something Awful, before it was rubbish.
"That Gay Farmers For Jesus site is completely batshit."
by Foul Egg January 20, 2003
 
2.
Off the deep end, crazy, insane. But worse.

See Gary Busey.
My mom has gone totally batshit; she tried to microwave our cat!
by HolyHeartFailure September 05, 2005
 
3.
The state of being crazy
"That crazy mofo drives me bat shit."
by Christel March 21, 2007
 
4.
insane, wildly irrational (see also go batshit}, and batshit crazy)
The kid was batshit. No wonder nobody wants to be his friend.
by Light Joker December 08, 2004
 
5.
extremely; very; to a degree beyond normal reckoning
bat-shit insane
by J Bindel January 20, 2004
 
6.
adj/adv. pejorative used to describe people or events that lack any sense of rationality or sanity.

N) Glen Beck
And what the fuck are you doing on television anyhow? Do you know I get calls every day from home thinking you went batshit (from the movie Casino).

Yeah, I watched the show today. Batshit started crying again.
by editor, fucked up dictionary November 04, 2009
 
7.
The Shit of Bats, see also guano
I stepped on some bat shit
by Go April 02, 2003