Definition of

Batty

  1. (adj, all) informal or slang terms for mentally irregular

via WordNet, Princeton University

Origin of the word Batty

  1. 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). more

via Online Etymology Dictionary, ©2001 Douglas Harper

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