Meaning of whacko in English:

whacko

exclamation

informal, dated British
  • Used to express delight and enthusiasm.

    ‘Home on Friday. Whacko!’
    • ‘Of course I'm not ending it here, ya whacko!’
    • ‘As for the suicidal farmer, the guy was a whacko!’
    • ‘The rest of them ranged from disquieting to downright whacko!’
    • ‘I got a peek at some of those positions before they were edited out, and believe me, they were whacko!’

Pronunciation

whacko

/wakˈəʊ/