what's-her-face

• what'sherface, whatsherface, what's-'er-face, what's'erface, what'serface, whats'erface, whatserface, whatseface, whaserface
• who's-her-face, who'sherface, whosherface, whoserface

Univerbation of what's +‎ her +‎ face (“self”, metonymic).

what's-her-face (plural what's-their-faces)

1. (informal, chiefly in the singular) A woman whose identity is unknown or forgotten (especially when better-known to the listener).

   Near-synonyms: what's-her-name (what's-his-name, what's-their-name); whatchamacallher (whatchamacallhim); you-know-who; so-and-so; see also Thesaurus:what's-their-name

   Coordinate terms: what's-his-face, what's-their-face