Definition of thingummy noun from the Oxford Advanced Learner's Dictionary

 

thingummy

 noun
noun
BrE BrE//ˈθɪŋəmi//
 
; NAmE NAmE//ˈθɪŋəmi//
 
(pl. thingummies)(also thingamabob
BrE BrE//ˈθɪŋəməbɒb//
 
; NAmE NAmE//ˈθɪŋəməbɑːb//
 
, thingumajig
BrE BrE//ˈθɪŋəmədʒɪɡ//
 
; NAmE NAmE//ˈθɪŋəmədʒɪɡ//
 
, thingy)
(informal)
 
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used to refer to a person or thing whose name you do not know or have forgotten, or which you do not want to mention It's one of those thingummies for keeping papers together. Is thingummy going to be there? You know, that woman from the Sales Department? Word Origin late 18th cent.: from thing + a meaningless suffix.