DictionarydoohickeyObject with an unknown name
noun

doohickey

DOO-hik-ee/ˈduːhɪki/

A gadget or object whose name is unknown or forgotten.

He holds the doohickey while trying to recall its name.

A compact two-scene illustration shows a man confidently using a small mechanical gadget, then holding up that same gadget with a searching expression and a hand at his temple.
Etymology

Doohickey is an arbitrary name for something the speaker cannot name. Its placeholder function is documented, but the supplied evidence gives no roots explaining its form.

In context

Hey Peter39:20
we find a doohickey on the top floor that projects an image of the Chinese dragon on the wall which reveals a hidden door
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More examples

  • He used a plastic doohickey to open the battery cover.
  • I found the missing doohickey beneath the workbench.
  • She attached the doohickey but could not remember its name.

Forms

doohickey · doohickeys

Similar words

thingamajig
Thingamajig is another informal placeholder for a forgotten object name.
gadget
A gadget is a small useful device; doohickey also signals that its name is unknown or unimportant.