whatsit /ˈwɒtsɪt/

• 1. 

  N-VAR You use whatsit instead of a noun or name which you cannot remember or which you do not want to say because it is rude. 那个什么 [口语]

  例：

  We wanted to be here early in case the whatsit, maintenance supervisor had forgotten to deal with it.

  我们想早点儿到这儿，以防那个什么维修主管忘了处理这个事儿。