doohickey

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doohickey

A name for a gadget or thing whose actual name is unknown or has been forgotten. Where's that doohickey? I need it to finish this repair. Hand me that doohickey or whatever it's called, will you?

doojigger

A name for a gadget or thing whose actual name is unknown or has been forgotten. Where's that doojigger? I need it to finish this repair. Hand me that doojigger or whatever it's called, will you?

whatchamacallit

Any thing the name of which is not known or cannot be remembered. Hand me that whatchamacallit over there. He said the machine will generate… whatchamacallit… electrostatic potential energy, something like that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

doojigger

and doohickey and doohickie (ˈdudʒɪgɚ and ˈduhɪki)
n. a name for a gadget. Toss me that little red doohickey, will you?

doohickey

verb

whatchamacallit

(ˈʍətʃəməˈkɑlɪt)
n. a name for a person or thing whose real name has been forgotten or is being avoided. I lost my—you know—my whatchamacallit—my watch!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

whatchamacallit

Something whose name is not known or has been forgotten. A slangy alteration of “what you may call it,” it dates from the first quarter of the twentieth century. For example, “He’s got that new gadget on his car, a whatchamacallit—oh, a GPS.” Similar if not quite synonymous terms are doohickey and thingamabob, dating from about the same time. For example, “The Digital Book System . . . a doohickey slightly bigger than a cassette box—that stores the equivalent of 10 Bibles” (Newsweek, December 7, 1992).
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
That since this kind of goal-setting seems to galvanize people, someone should invent a doohickey for measuring other stuff as well.
A doohickey that ingeniously looks outwards instead of inwards and, in so doing, addresses so much more than BMI, peak flow and dress size.
Just imagine if a doohickey on our wrists could measure all that for us.