Once the policy changes, the powerless commoners can only count themselves unlucky.
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Self-deprecating internet slang, often bitter. Speakers use it about themselves to vent over inequality with the powerful (官 / 富); calling someone else 屁民 is insulting.
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屁 (pì, 'fart') + 民 (mín, 'citizen') — literally 'fart-citizen,' the citizen whose opinion counts about as much as a fart. The English coinage 'shitizen' captures the same vibe.