/ ˈduːdɑː; NAmE / ( BrE ) ( NAmE doo·dad / ˈduːdæd; NAmE /) noun
( informal ) 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 the song Camptown Races .