adjective, battier, battiest. Slang.
insane; crazy; eccentric.

bat2 + -y1

battiness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
batty (ˈbætɪ)
adj , -tier, -tiest
1.  insane; crazy
2.  odd; eccentric
[C20: from bat²; compare the phrase have bats in the belfry]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1580s, "pertaining to bats," from bat (n.2). Slang sense "nuts, crazy" is attested from 1903, from the expression (to have) bats in (one's) belfry, also meaning "not right in the head" (1901).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

bats definition

  1. mod.
    and batty. crazy. : You are driving me batty! , You are bats if you think I would ever wear a haircut like that.
  2. mod.
    and batty. alcohol intoxicated; confused and drunk. : The guy was bats—stewed to his ears. , He was a bit batty, but he'd been drinking since noon, so no one was surprised.
  3. n.
    the batsthe delirium tremens. (Always with the.) : My buddy is shaking because of a slight case of the bats.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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