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Jyutping sei2 dou1 m4 zi1 dim2 sei2
Pinyin sǐ dōu wú zhī diǎn sǐ

Definitions (Wiktionary)
  1. phrase, Cantonese
    sure to die a reckless death
    (syn.) 死都不知道怎么死的, 死都不知道怎麼死的