Definition of "thingumbob" []

• An indefinite name for any person or thing which a speaker is at a loss, or is too indifferent, to designate more precisely. (noun)

The Century Dictionary (Public Domain)

• ""thingumbob," which took for them a very different turn indeed."
• "Chingaladdo – equates to thingamajob, thingumbob, whatsis, and whatchamacallits of this ilk. * via a misspent youth"
• "“I was only wanting the thingumbob, yer honour,” said Tom, pretending to search diligently in the drawer for some required article."