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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."
de Foul Egg 20 janvier 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!
de HolyHeartFailure 5 septembre 2005
 
3.
The state of being crazy
"That crazy mofo drives me bat shit."
de Christel 21 mars 2007
 
4.
insane, wildly irrational (see also go batshit}, and batshit crazy)
The kid was batshit. No wonder nobody wants to be his friend.
de Light Joker 8 décembre 2004
 
5.
extremely; very; to a degree beyond normal reckoning
bat-shit insane
de J Bindel 20 janvier 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.
de editor, fucked up dictionary 4 novembre 2009
 
7.
The Shit of Bats, see also guano
I stepped on some bat shit
de Go 2 avril 2003