Definition of fiddle-de-dee in English:

fiddle-de-dee

noun

dated
  • [often as exclamation] Nonsense.

    • ‘And, fiddle-de-dee, he doesn't have to worry much about politics, either; some other book can do that.’
    • ‘Holding his position firmly near the bottom of the list is Seth and his fiddle-de-dee love songs about Dartmoor.’
    • ‘Initially, he worked in the manner of Gainsborough, but slowly developed his own style of conveying nature and humble subjects so as to appear spontaneous and without what he called ‘fal-de-lal or fiddle-de-dee’.’
    • ‘Alice thought she saw a way out of the difficulty this time. ‘If you'll tell me what language fiddle-de-dee is, I'll tell you the French for it!’’

Origin

Late 18th century: from fiddle + a reduplication.

Pronunciation

fiddle-de-dee

/ˌfidl dē ˈdē/