doodah

noun
🔊/ˈduːdɑː/
🔊/ˈduːdɑː/
(British English)
(North American English doodad
🔊/ˈduːdæd/
🔊/ˈduːdæd/
)
(informal)
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  1. a small object whose name you have forgotten or do not know(忘掉名称或叫不出名目的)小装置,小玩意儿
    Word Originearly 20th cent. (in the phrase all of a doodah): perhaps from the refrain of a song called Camptown Races.