Definition of doodah noun from the Oxford Advanced Learner's Dictionary

 

doodah

 noun
noun
BrE BrE//ˈduːdɑː//
 
; NAmE NAmE//ˈduːdɑː//
 
(British English)(North American English doodad
BrE BrE//ˈduːdæd//
 
; NAmE NAmE//ˈduːdæd//
 
)
(informal)
 
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a small object whose name you have forgotten or do not know Word Origin early 20th cent. (in the phrase all of a doodah): perhaps from the refrain of a song called Camptown Races.