noun
a nonspecific or placeholder term used to refer to an object whose name is unknown or forgotten
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The engineer referred to the small device as a thingamajiggy in his technical report.
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Can you pass me that thingamajiggy over there?
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I have no idea what this thingamajiggy is for.
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The concept of love is like a mysterious thingamajiggy that we can't fully understand.