whatshisname
noun [ S ] informal (mainly UK whatsisname); (US whats-his-name) uk/ˈwɒts.ɪz.neɪm/ us/ˈwɑːts.ɪz.neɪm/ (also whatshisface, whats-his-face)
名叫某某的他，某个他（用于忘记男子的名字时）
used for referring to a man or boy when you cannot remember or do not know his name
Have you invited Mike Whatshisname to the party? 你邀请那个叫迈克什么的人来参加聚会了吗？