WordReference Random House Learner's Dictionary of American English © 2014
thing•a•ma•jig /ˈθɪŋəməˌdʒɪg/USA pronunciation n. [countable][Informal.]
something whose name the speaker does not know or has forgotten:Hand me the thingamajig from the bookshelf, please.

'thingamajig' also found in these entries:
In the English description:

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