'crackers' definitions:

Definition of 'crackers'

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 'crackers'

From: GCIDE
  • crackers \crackers\ adj. crazy. [informal or slang]
  • Syn: balmy, barmy, bats, batty, bonkers, buggy, cracked, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, wacky. [WordNet 1.5]