what's-his-face

• what'shisface, whatshisface, what's-'is-face, what's'isface, what'sisface, whats'isface, whatsisface, whatseface, whasisface
• who's-his-face, who'shisface, whoshisface, whosisface

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

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

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

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

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