Fiddledeedee is defined as nonsense.noun
When someone says something that you think is nonsense or utter foolishness, this is an example of a time when you might say "Fiddledeedee."YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Origin: prob. < fiddle, with addition of nonsense syllables
Used by arrangement with John Wiley & Sons, Inc.