Tā zài lǐngdǎo miànqián shì yí tào, bèihòu yòu shì yí tào, zhēn shì ge yīnyángrén.
He acts one way in front of the boss and another behind their back — a real two-faced person.
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The medical sense is dated; modern Chinese prefers 双性人 (shuāngxìngrén) or 间性人 (jiānxìngrén). The 'two-faced' sense is recent internet slang derived from 阴阳怪气 (yīnyáng guàiqì, sarcastic/passive-aggressive).
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On Chinese social media, calling someone 阴阳人 usually means they switch tone or position depending on their audience — not a comment on gender or biology.
