A polite way of saying bat-shit crazy.

(Guano is the polite term for bat feces.)

quoted from Sevastian Winters, Yahoo contributor: 8/18/2011
I generally give Michelle Bachmann the benefit of the doubt, but I still think she is guano crazy.
by hir0 August 20, 2011
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A more polite, euphemistic, SFW way to describe someone who would otherwise be bat shit crazy
- Dude, so you ex threatened to break your necklace while you were sleeping?

- I know! I told you she was bat guano crazy!!!

- No wonder you dumped her, she IS bat guano crazy... just send her sorry ass to Arkham Asylum already!!!!
by el patron himself October 11, 2010
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