batshit

vulgar slang

1. :  very irrational, excited, or angry :  ¹crazy Some say he's smart and some say he's permanently batshit—but they don't say it to his face … . Besides, most truly talented people are, well, strange. — Linda Ellerbee, And So It Goes, 1986 This tended to drive the real Hollywood people … absolutely batshit. — Jay McInerney, The Guardian (London), 3 Nov. 1996 —often used with go … she shows you that you are not alone in the world, … lets you know that everyone goes batshit sometimes, and that recovering from it can lead you to expectations and views that translate to a new life, a better life. — Sridhar Pappu, The Atlantic, January/February 2005