Definition of flapdoodle in US English:

flapdoodle

noun

US
informal
  • 1Nonsense.

    ‘people who are prey to dogmatic flapdoodle’
    • ‘For years, nitwits have been churning out flapdoodle like Leadership Secrets of Attila the Hun and connect-the-dots management guides purporting to apply the wisdom of Machiavelli to the modern boardroom.’
    • ‘They are not swallowing in toto the old flapdoodle in the way that the preachers want them to do.’
    • ‘The latest piece of flapdoodle concerns Downing Street's plans to dock child benefit from the parents of tearaway children.’
    • ‘It looks like typical, classic, psychic flapdoodle to me.’
    • ‘Commentary has pretty much adopted him as their science guy, and he has published a steady stream of flapdoodle in their pages over the last decade.’
    rubbish, balderdash, gibberish, claptrap, blarney, guff, blather, blether
    View synonyms
    1. 1.1 A fool.
      • ‘When she heard what happened, she sighed, shook her curly-haired head and said of Learner, ‘What a flapdoodle!’’

Origin

Mid 19th century: an arbitrary formation.

Pronunciation

flapdoodle

/ˈflapˌdo͞odl//ˈflæpˌdudl/