Definition of ning-nong in English:

ning-nong

noun

NZ, Australian
informal
  • A fool.

    • ‘When he recites his fumbler's catalogue of rightwing Republican inanities, we hear the sing-song of a ning-nong.’
    • ‘Nope, it was just crazy me being a ning-nong!’
    • ‘Please - a lost game of rugger hardly rates up there with the killing fields of war. What a ning-nong.’

Origin

Mid 19th century: of unknown origin.

Pronunciation

ning-nong

/ˈnɪŋnɒŋ/