whatchamacallit

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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?

thingamabob

Some tool, gadget, or other such implement the proper name for which is unknown or unremembered. A: "What is that thingamabob over there?" B: "That's a power coupler. Don't touch it." It looks like the signal is controlled by this joystick-looking thingamabob.

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.

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 ?
"They hate that," says Blanken, fresh from a workshop with the whatchamacallits in L.A.
Future inventors will enjoy the Doodad Dump, where materials donated by various local industries can be glued together to form an infinite variety of thingamajigs and whatchamacallits. Other exhibits-such as a climbing structure with movable bars, and a tunnel that can be reconfigured to zig here and zag there-just encourage creative physical play.
In addition to gadgets, gimmicks, gizmos, dinguses, doodads and doojiggers, we seem to have several dozen whatchamacallits as well.
The waste basket in my so-called office, AKA "the yellow thing." is filled with rolled-up notebook pages of inky round swirly circles - whatchamacallits themselves - evidence of my vain attempts to resurrect these poor excuses for writing implements.
Some troops made SWAPS - Special Whatchamacallits Affectionately Pinned Somewhere - that the girls could collect as keepsakes of the various countries.