any object or person whose name you have temporarily forgotten or do not know名叫某某的人,那个叫什么的东西(用于忘记名字时)
Where's the whatsit that you change channels with?你换频道用的那个叫什么的东西哪儿去了?
You'd better tell whatsit - what's his name - the guy in charge of stationery.你最好告诉那个人——他叫什么名字来着——就是那个负责管文具的人。