Green’s Dictionary of Slang

insane, crazy, also as adv.; thus go batshit v., to become insane, to act crazily; drive batshit v., to drive mad.

1966		R. Stone Hall of Mirrors (1987) 202: You’re batshit.
1972		(con. 1965) E. Grogan Ringolevio 227: He just wanted to know whether the private [...] was trying to punk out of that war, or was truly bat-shit.
1978		R. Price Ladies’ Man (1985) 90: To sit there and listen to me talk like a normal man with a healthy sex drive must have driven him batshit.
1981		J. Ellroy Brown’s Requiem 105: Nothing’s working anymore, everything’s changing and it’s driving me fucking batshit.
1988		S. King Tommyknockers (1989) 176: Just to keep from going batshit with the noise, I keep up with them.
1991		C. Hiaasen Native Tongue 35: I’ll bet the boss man is going batshit.
2003		J. Lethem Fortress of Solitude 428: Attica’s just batshit, like Apocalypse Now.
2006		G. Iles Turning Angel 163: That drives me batshit.
2007		J. Grady Mad Dogs 269: Me, I melted down in the subway where Vic and Russell [...] kept me from going batshit.
2010		J. Ellroy Hilliker Curse 23: I yearned for mental monogamy. It drove me batshit.
2011		Eve. Standard 5 Aug. 14/2: Her fellow Republicans [...] think she is, as they like to say here, bat-shit crazy.
2011		J.J. DeCeglie Drawing Dead [ebook] It was a batshit wild plan, crowded to the brim with adversity and disorder.
2015		S. King Finders Keepers (2016) 58: You’re just batshit-crazy on the subject of Jimmy Gold.
2016		Twitter 28 Nov. 🌐 So how will the GOP deal with having elected a profoundly ignorant and increasingly obviously bat-shit president?
2018		‘Aidan Truhen’ Price You Pay 89: [T]hose [misogynistic] attitudes are batshit ridiculous.
2018		C. Hammer Scrublands [ebook] ‘It’s batshit crazy [...] Some things don’t need a reason; they just happen’.
2020		D. Winslow ‘Sunset’ in Broken 209: [A] stakeout, the tedium of which used to drive him batshit crazy.
2021		J. Ellroy Widespread Panic 55: Rock Hudson’s going batshit with boys of all races, colors and creeds.
2021		L. McInerney Rules of Revelation 313: [S]he offered no explanation but a batshit smile.
2023		(con. 1962) J. Ellroy Enchanters 240: Clemmons is batshit crazy.