haywire

(noun) wire for tying up bales of hay.

(adj) informal or slang terms for mentally irregular. 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. Examples: "It used to drive my husband balmy."

(adj) not functioning properly. Synonyms: amiss(predicate), awry(predicate), wrong(predicate). Examples: "Something is amiss." "Has gone completely haywire." "Something is wrong with the engine."