Definition of "thingummy" [thingummy]

• Something one does not remember the name of (noun)

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• "It seemed to roe that there was a sort of something in her voice, a kind of thingummy, you know."
• "I knew about the indirect costs thingummy, but thanks for the other info anyhow"
• "Nobody looks across the border of their country and says, What a lovely thingummy they have over there in that other country."