what's-his-namenoun [ S ]
informal mainly UK whatsisname, US whatshisname uk/ˈwɒts.ɪz.neɪm/us/ˈwɑːts.ɪz.neɪm/also what's-his-faceused for referring to a man or boy when you cannot remember or do not know his name:
Have you invited Mike Whats-his-name to the party?