'Batty' definitions:

Definition of 'batty'

From: WordNet
adjective
Informal or slang terms for mentally irregular; "it used to drive my husband balmy" [syn: balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky]

Definition of 'Batty'

From: GCIDE
  • Batty \Bat"ty\ (b[a^]t"t[y^]), a.
  • 1. Belonging to, or resembling, a bat. "Batty wings." --Shak. [1913 Webster]
  • 2. Crazy; demented; loony; nuts; as, her constant gabbing is driving me batty. [Colloq.]
  • Syn: bats. [PJC]