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Batshit crazy

Posted by ESC on November 17, 2006

In Reply to: Batshit crazy posted by William W. Webb on November 17, 2006

: What is the etymology of the phrase "batshit crazy" or "bat shit crazy"?

: Does this have something to do with a malady afflicting guano miners?

: Or is histoplasmosis or nitrate poisoning involved?

Bats = crazy. Probably from the way they fly around in a seemingly crazy manner. I don't know how bat-sh*t crazy would have evolved.