noun
a term used to refer to something for which one does not know or cannot remember the name
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The technician used a specialized thingumabob to calibrate the equipment.
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Can you pass me that thingumabob over there?
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I have no idea what this thingumabob does, but it looks cool.
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His argument was full of thingumabobs and whatnot, but it didn't make much sense in the end.