One step beyond just plain crazy. It is usually a temporary thing...sparked by something unexpected, or just really awful.
As soon as he saw me humping his mom, he went bat-shit crazy.
by ithaqua April 13, 2003
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Some one who is so off the wall insane that they just do the dumbest, most immature, revolting things.
My Ex-Girfrend e-mailed my new girl trying to scare her off
She is bat shit crazy!
by Ouch! Don't do that March 21, 2010
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Someone who has lost their FREAKIN' mind.

Some examples are Sherri, Joanie, Ashley, Tammy, Amanda
Whoa Nelly! Did you overhear their conversation this morning....Those girls are Bat-shit crazy!

I wonder what's wrong with those girls? They seem to have gone bat-shit crazy.
by Demands James December 30, 2016
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A common phrase that is deeply rooted in the Australian vernacular and frequently used to convey your disappointment in a person or a thing.
"Your performance was as boring as bat shit," said Kyle Sandilands, a past judge from Australian Idol.
by Norman Harvey February 19, 2016
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Bat shit meaning: beyond being insane or totally crazy.
Beautiful meaning: attractive, lovely, gorgeous, good looking.

Combine the both, the "subject" is described as bat shit beautiful that combination put together.
That gigantic explotion turned out bat shit beautiful.
by Crasydraw January 18, 2018
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The highest level of crazy, which causes people to outrageous things that automatically attract media attention.
Why is Britney wearing her wedding dress in public?
She's bat-shit crazy.
by AJV22044 January 17, 2008
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