Etymology
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doodad (n.)

"unnamed thing," 1898, chiefly U.S., a made-up word (compare doohickey).

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Definitions of doodad

doodad (n.)
something unspecified whose name is either forgotten or not known;
she eased the ball-shaped doodad back into its socket
Synonyms: doohickey / doojigger / gimmick / gizmo / gismo / gubbins / thingamabob / thingumabob / thingmabob / thingamajig / thingumajig / thingmajig / thingummy / whatchamacallit / whatchamacallum / whatsis / widget
From wordnet.princeton.edu