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Related to thingmajig: thingamajig
Some tool, gadget, or other such implement the proper name for which is unknown or unremembered. A: "What is that thingmajig over there?" B: "That's a power coupler. Don't touch it." It looks like the signal is controlled by this joystick-looking thingmajig.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.