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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Acting in an obviously crazy manner, psychotic, disconnected from reality
Who is she talking to? There is no one there.-She's bird-shit crazy.
by lilgirl4 January 29, 2009
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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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Slang term to describe a person who has gone crazy, often to describe a tweaker.
My friend was tweaking and then he went bat-shit crazy and started talking to the walls about pink elephants.
by Bottom Twink January 22, 2016
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When a person gets so mad that they are about to start throwing shit, like apes do.
you: Did you hear that Rachel cheated on Greg?
me: Yeah, he went all ape shit crazy.
you: i though he was about to start throwing shit, like the angry monkeys at the zoo.
by {NH} March 7, 2011
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