n. (pl. -ies) (also thingamy, thingumabob, thingumajig) colloq. a person or thing whose name one has forgotten or does not know or does not wish to mention. [THING + meaningless suffix]
THINGUMMY
Meaning of THINGUMMY in English
English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012