what's his/her/their name

what's his/her/their name

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

what’s his name

verb
See what’s his face
See also: name
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • what’s his name
  • whatshername
  • whatshisname
  • put a name to
  • put a name to (someone or something)
  • put a name to somebody/something
  • in the name of heaven
  • go by
  • go-by
  • Jane Roe