An emphatic variant exclamation of dismissal, disbelief, or exasperation; variant spelling emphasizing the repeated syllables.
An extended form of 'fiddledee' with doubled final syllables for emphasis. The repetition was intentionally nonsensical to mock trivial matters.
The spelling variation shows how speakers naturally extended the word for emphasis—the extra 'dee' isn't in the dictionary for no reason, but because people actually said it with more exaggeration for stronger dismissal.
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