Top definition
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
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug