Meaning of “whatsit” in the English Dictionary

british dictionary

"whatsit" in British English

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whatsitnoun [ C ]

uk /ˈwɒt.sɪt/ us /ˈwɑːt.sɪt/ informal

any object or person whose name you have temporarily forgotten or do not know:

Where's the whatsit that you change channels with?
You'd better tell whatsit - what's his name - the guy in charge of stationery.

(Definition of “whatsit” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)