Definition of thingamajig noun from the Oxford Advanced American Dictionary

 

thingamajig

 noun
noun
NAmE//ˈθɪŋəmədʒɪɡ//
 
(also thingamabob
NAmE//ˈθɪŋəməˌbɑb//
 
, thingy)
(informal)
 
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used to refer to a thing whose name you do not know or have forgotten, or which you do not want to mention It's one of those thingamajigs for keeping papers together.