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Definition: (textspeak) A Kongish code-mixing term derived from '小心', meaning becareful.
Usage: E.g. This prof real is killer, u better siu sum.
Synonym: 小心
Reference: https://www.hk01.com/開罐/283411/大學生打字用火星文-10句港式英文拼音大挑戰-測試你識幾多