whatchamacallit
noun/ˈwɒtʃəməkɔːlɪt/
/ˈwʌtʃəməkɔːlɪt/
(informal)- used when you cannot think of the name of something
- Have you got a whatchamacallit? You know… a screwdriver?
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whatchamacallit
Definition of whatchamacallit noun from the Oxford Advanced Learner's Dictionary