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To describe something/someone that is beyond crazy and insane.
In particular, insanity to the degree of being extreme.
Also is a way to describe someone who lacks any sense or rationality.
Also describes a state of being crazy.
Synonyms include: irrational, insane, crazy, extreme, delusional, lunatic, etc.
Wow, that bitch who picked a fight with me yesterday was batshit!
Off the deep end, crazy, insane. But worse.

See Gary Busey.
My mom has gone totally batshit; she tried to microwave our cat!
batshit by HolyHeartFailure September 22, 2005
insane, wildly irrational (see also go batshit}, and batshit crazy)
The kid was batshit. No wonder nobody wants to be his friend.
batshit by Light Joker December 8, 2004
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.
I pranked Amy by replacing her Civet Shit coffee beans (Kopi Luwak) with some batshit. She drank the brew & that's how she caught China virus.
Batshit by Jumbled McGobbledygook December 19, 2020
Britney Spears is BATSHIT crazy, bitch is out of her damn mind.
batshit by AkkuROX January 23, 2008