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Related to thingumabob: whatsis
thing·a·ma·bobor thing·u·ma·bob (thĭng′ə-mə-bŏb′) also thing·um·bob (thĭng′əm-bŏb′)
informal a person or thing the name of which is unknown, temporarily forgotten, or deliberately overlooked. Also: thingumajig, thingummyjig, thingumbob or thingummy
[C18: from thing1, with humorous suffix]
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|Noun||1.||thingumabob - something unspecified whose name is either forgotten or not known; "she eased the ball-shaped doodad back into its socket"; "there may be some great new gizmo around the corner that you will want to use"|
gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget, doodad, doohickey, doojigger, gimmick
stuff - miscellaneous unspecified objects; "the trunk was full of stuff"