Used as an intensifier, particularly for insane or .
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.
Nonsense, hogwash.
"God, that is such… such batcrap!" Edith exploded.
From bat + crap, as a euphemism for batshit.
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