Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Slang Crazy; insane.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Mad, crazy, silly.
  • adj. Belonging to, or resembling, a bat (mammal).
  • n. The buttocks or anus.
  • n. A homosexual man.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Belonging to, or resembling, a bat.
  • adj. Crazy; demented; loony; nuts.

from The Century Dictionary and Cyclopedia

  • Of or resembling a bat; battish.
  • n. Rice while growing.
  • n. A measure for rice in India, equal to 120 pounds. McElrath, Com. Dict.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. informal or slang terms for mentally irregular

Etymologies

From bats in the belfry.
(American Heritage® Dictionary of the English Language, Fourth Edition)
bat +‎ -y. In sense “insane”, attested 1903, from expression have bats in one's belfry, from tendency of bats to fly around erratically. Compare also batshit ("insane") and squirrelly ("jumpy, eccentric"). (Wiktionary)

Examples

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