A corporate drone often has to reply to messages even on weekends.
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Orthographic loan from Japanese 社畜 (shachiku): 社 'company' + 畜 'livestock'. Self-deprecating urban-office slang, often paired with 996 (9am–9pm, 6 days), 打工人 (worker), 卷 (overly competitive). Lighter than 奴隶 — used to bond, not accuse.