Etymology
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doohickey (n.)

also doohicky, a name for something one doesn't know the name of, 1914, American English, arbitrary formation.

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Definitions of doohickey

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