noun Informal.
Also, thingumabob, thingumbob [thing-uhm-bob] .

1835–45; see thingamajig, bob2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thingumabob or thingamabob (ˈθɪŋəməˌbɒb)
informal thingumajig, thingamajig, Also: thingummy a person or thing the name of which is unknown, temporarily forgotten, or deliberately overlooked
[C18: from thing1, with humorous suffix]
thingamabob or thingamabob (ˈθɪŋəməˌbɒb, ˈθɪŋəməˌdʒɪɡ, ˈθɪŋəmɪ)
[C18: from thing1, with humorous suffix]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Think of something else, something soothing, and the name of the spaghetti thingamabob will come to you unsummoned.
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