Meaning of antwacky in English:

antwacky

Pronunciation /anˈtwaki/

adjective

informal Northern English
  • Old-fashioned; out of date.

    • ‘it's weird being on one of those antwacky trains where you have to reach out the window to open the door’
    • ‘his clobber was proper antwacky’
    out of date, outdated, dated, out, out of fashion, outmoded, unfashionable, last year's, frumpish, frumpy, out of style, outworn, old, old-time, old-world, behind the times, archaic, obsolescent, obsolete, ancient, antiquated, superannuated, defunct

Origin

1970s Liverpudlian dialect; apparently a humorous alteration of antique, perhaps with a punning reference to wacky.