Bat tier


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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