Etymology From bat + crap, as a euphemism for batshit.
1
Often, Slang, Vulgar Too irrational to be dealt with sanely.
What I like is a certain ambiguity in a story, but I've come to understand over the years that that drives most people absolutely batcrap!2007, The Comics Journal, numbers 280-283, page 89:
Etymology From bat + crap, as a euphemism for batshit.
1
Often, Slang, Vulgar Used as an intensifier, particularly for insane or synonyms.
That kind of behavior made me more certain than ever that, once he was pushed to batcrap-crazy extremes, he'd be forced to see the depth of his obsessions, and then he'd start to develop a more realistic perspective on the whole health nut thing.2011, Gary Paulsen, Liar, Liar: The Theory, Practice and Destructive Properties of Deception, Wendy Lamb Books, published 2011, →ISBN, page 56:
batcrap
noun
Etymology From bat + crap, as a euphemism for batshit.