Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: Probably from the meaningless word dooda in the song Camptown Races

doodah

 noun
     
doo‧dah British English; doo‧dad American English [countable] informal
a small object whose name you have forgotten or do not know:
Where's the doodah to turn off the TV?
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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