耗子尾汁

Born from a viral 2020 video of elderly martial arts braggart Ma Baoguo, who mispronounced the idiom '好自为之' (hǎo zì wéi zhī, meaning 'behave yourself' or 'reflect on your actions') in his thick regional accent, turning it into the nonsensical-sounding 'hào zi wěi zhī' — literally 'rat tail juice.' Chinese netizens instantly weaponized the absurd phrase as a mock-serious way to scold someone, tell them to check themselves, or humorously admit one's own failings.

Ma Baoguo was a self-proclaimed kung fu master who went viral after being knocked out in seconds by an amateur MMA fighter, yet continued posting pompous lecture videos online. His grandiose, error-filled speech became rich meme material in 2020, arriving at a time when Chinese youth were broadly skeptical of self-important authority figures and hungry for internet-born satire.

源自马保国视频中的方言发音，原为"好自为之"，意指好好反省自己，后被网友广泛用于调侃。