Definition of whatchamacallit noun from the Oxford Advanced American Dictionary

 

whatchamacallit

 noun
noun
NAmE//ˈwʌtʃəməˌkɔlɪt//
 
, NAmE//ˈwɑtʃəməˌkɔlɪt//
 
(informal)
 
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used when you cannot think of the name of something Have you got a whatchamacallit? You know… a screwdriver?
See the Oxford Advanced Learner's Dictionary entry: whatchamacallit