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thingamajig

thing·a·ma·jig (thing·um·a·jig)

thingamajig (thingumajig)

 
pronunciation:
thIng m jIg
part of speech: noun
definition: (informal) something for which the precise name is unknown or has been forgotten.
I want to buy one of those thingamajigs that turns lamps on and off.
similar words:
thing