/ · 1894 Brewer’s · F · Fiddle-de-dee!
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An exclamation signifying what you say is nonsense or moonshine. Fiddle-de-dee is meant to express the sound of a fiddle-string vocalised. Hence “sound signifying nothing.”
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.