thingamabob

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thing·a·ma·bob

or thing·u·ma·bob  (thĭng′ə-mə-bŏb′) also thing·um·bob (thĭng′əm-bŏb′)
n. Informal
A thingamajig.

[Alteration of thingumbob : obsolete thingum (from thing) + bob.]

thingamabob

(ˈθɪŋəməˌbɒb) or

thingamybob

n
informal a person or thing the name of which is unknown, temporarily forgotten, or deliberately overlooked. Also: thingamajig, thingamyjig or thingamy
[C18: from thing1, with humorous suffix]

thing•a•ma•jig

or thing•u•ma•jig

(ˈθɪŋ ə məˌdʒɪg)

n.
a thing for which the speaker does not know or has forgotten the name.
[1870–75; thingum or thingummy (based on thing1) + jig1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.thingamabob - something unspecified whose name is either forgotten or not knownthingamabob - 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"
stuff - miscellaneous unspecified objects; "the trunk was full of stuff"