What is the meaning of haywire?

noun

• Wire for tying up bales of hay.

adjective

• Informal or slang terms for mentally irregular.
  • usage: "it used to drive my husband balmy"
  • synonyms: balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky
• Not functioning properly.
  • usage: "something is amiss"; "has gone completely haywire"; "something is wrong with the engine"
  • synonyms: amiss, awry, wrong