Doohickey

//ˈduhɪki// noun, slang

Definitions

Noun
  1. 1
    A thing (used in a vague way to refer to something whose name one does not know or cannot recall) slang

    "What does this doohickey do?"

  2. 2
    something unspecified whose name is either forgotten or not known wordnet

Etymology

First attested 1914, of uncertain origin, probably from doodad + hickey.

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