thingamajig

[thing-uh-muh-jig]
noun Informal.
a gadget or other thing for which the speaker does not know or has forgotten the name.
Also, thingumajig.


Origin:
1870–75; thingum or thingummy + jig1, metrically patterned like gobbledygook, rigamarole; thingum perhaps orig. from the gradational compound thingum-thangum (based on thing1) with the same terminal syllable as in crinkum-crankum, harum-scarum, trinkum-trankum, the ultimately orig. of which is unclear

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

thingamajig definition

[ˈθɪŋəmədʒɪg] and [ˈθɪŋi]
and thingy
  1. n.
    a gadget for which the proper name has been forgotten or is unknown. : Hand me that thingamajig with the copper base, will you?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Once its bat-winged supernatural thingamajig appears, the beast isn't half as horrifying as you imagined.
Other items available for rent include the slide, the basketball hoops, inflatable dolphin and inflatable thingamajig.
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