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English definition of “whatchamacallit”

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whatchamacallit

noun [C] uk   /ˈwɒtʃ.ə.məˌkɔːl.ɪt/ us    /ˈwɑː.tʃə.məˌkɑː.lɪt/ informal
used when you are speaking about something or someone whose name you can not remember: I need a - a whatchamacallit - one of those things that you can caramelize sugar with.
(Definition of whatchamacallit from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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