batshit (uncountable)
(vulgar, literally) fecal matter produced by bats
(slang, vulgar) nonsense, horseshit; especially when said by or attributed to someone irrational.
(slang, vulgar) extreme irrationality or unreasonableness, insanity, craziness.
batshit (comparative more batshit, superlative most batshit)
(slang, vulgar) extremely irrational or unreasonable, insane, crazy.
batshit (not comparable)
(slang) Used as an intensifier, particularly for insane or synonyms.