whachamacallit

n.1.Any object whose name is forgotten, or not known.
References in periodicals archive ?
Three months elapse and Carmen hears news that Bill, who is still working for Gadget, has just received the assistant comptroller of the year award from the Whachamacallit Manufacturers Association.
Folks come by from over in Qwik--you can tell them because they're all hung around with those silver furs and big blocky whachamacallits on their elbows.