what’s his face

what's his/her/their face

A phrase used to refer to someone whose name the speaker does not know or cannot remember. And then what's their face showed up at the party and ruined the whole thing! Dave has been dating what's her face for a few months now.
See also: face
Farlex Dictionary of Idioms.

what’s his face

and what’s his name
n. someone whose name has been forgotten; someone whose name is being avoided. I can’t remember what’s his face’s name either. I remember what’s his name’s face, but the moniker is lost and gone forever.
See also: face
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • what's his face
  • what's his/her face
  • what's his/her/their face
  • what's his/her/their name
  • whatshername
  • whatshisname
  • what’s his name
  • this is why we can't have nice things
  • (one's) best foot forward
  • best foot forward