The noun haywire refers to a type of wire once used in baling hay and sometimes for makeshift repairs. This hurried and temporary use of haywire gave rise to the adjective (and sometimes adverb) haywire. When the adjective was first used in the early 20th century, it was primarily found in the phrase “haywire outfit,” which originally denoted a poorly equipped group of loggers, and then anything that was flimsy or patched together. This led to a “hastily patched-up” sense, which in turn gave us the now-common meaning, “being out of order or having gone wrong.” The “crazy” sense of haywire may have been suggested by the tendency of the relatively weak and rust-prone wire to fail at inopportune times, or to get tangled around legs, or possibly to the disorderly appearance of the temporary repair jobs for which it was used.