[po-faced] adj [perh. fr. po chamber pot, toilet, fr. F pot pot] (1934) Brit: having an assumed solemn, serious, or earnest expression or manner: piously or hypocritically solemn
PO-FACED
Meaning of PO-FACED in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012