thingamajig

or thing·u·ma·jig

[ thing-uh-muh-jig ]
/ ˈθɪŋ ə məˌdʒɪg /

noun Informal.

a gadget or other thing for which the speaker does not know or has forgotten the name.

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Origin of thingamajig

First recorded in 1870–75; thingum or thingummy + jig1, metrically patterned like gobbledygook,rigamarole;thingum perhaps originally from the gradational compound thingum-thangum (based on thing1) with the same terminal syllable as in crinkum-crankum,harum-scarum, trinkum-trankum, perhaps dog Latin or a facetious alteration of trinkets
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for thingamajig

  • By Jove, Madge, I jolly well hoisted him with his own thingamajig!

    The Prodigal Father|J. Storer Clouston