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.
what's-his/her/their-name
Used to indicate a person whose name is not known or can't be remembered. Sometimes the hyphens and apostrophe are removed to form a single unbroken word. I heard old what's-his-name is back to teaching the course again next week. I ran into whatshername from next door down at the grocery store this morning.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.