Thingamajig's origination is unknown but maybe the most well known place would be sim city 2000 where one of the industrial buildings where named "Thingamajig". Thingamajig describes something you have no idea how to describe.
It's a... hmmm... a... thingamajig probably.
by D00M March 15, 2005
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Used to refer to something which you can't remember the name of. Also used as thingamajig.
Can you get me that thingamajiger over there?
You just click on the thingymajiger in the upper left-hand corner.

(also somethimes used with "one" and/or "the" as in "the one thingamajiger".
by Josh L. J. April 5, 2008
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"Your thingamajig is UGLY!"
by TheWiggidy October 31, 2003
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When the correct name of whatever you're speaking about is forgotten magically and you end up spouting this gibberish word
Not very smart guy: hey you know those, uhhh, beep boop typey thingamajigs in the computer room
Smart guy: the COMPUTERS?
Not very smart guy: uhh, yeah those
by Sir Beans of Heinzington March 25, 2023
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The vehicle that the Cat in the Hat drives when he goes on adventures.
To the Thingamajig everybody!
by M.E. ~a person who paints September 14, 2020
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The term used when someone doesn't know what that thing is.
Well you should at least buy that thingamajig.
by Word999 October 11, 2019
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