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3. bat-shit crazy
Crazy to a degree bordering on complete insanity. The state in which one makes decisions which make the exact opposite of sense.

See also: bat-shit
Why did Erin cheat on you with that greaseball?
- Because she's bat-shit crazy.
by DJ Bitterbarn Aug 11, 2004 add a video
1. bat-shit crazy
Acting in a generally insane manner; Tom Cruise.
When Tom Cruise jumped on Oprah's couch, he proved he was bat-shit crazy.
2. bat-shit crazy
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 Apr 13, 2003 add a video
4. bat-shit crazy
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.
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