A word used to replace a word that you don't know. "Doohickey" and "thingamajig" are equivalents.
You just push the button on the watchamacallit, then it's ready!
by th100 May 27, 2010
A word to say when you can't recall the word you require.
Ohmygosh! Have you ever seen or been to... *click fingers* uhhh..... watchamacallit?
by jessklara August 26, 2011
The hershey candy bar with the biggest frikin name ever. They must've had some real good ideas on the name thinking this one up.
Hershey board meeting:

CEO 1:So do we have any suggestions for this new candy bar. No?, well lets put on our thinking caps guys, because this is one hard nut to crack. Its more of a watchamacallit?
by NateK July 10, 2005

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