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Jyutping sei2 sing6 baa2 hau2
Pinyin sǐ shèng bǎ kǒu

Definitions (Wiktionary)
  1. verb, Cantonese
    to be very talkative

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Jyutping sei2 zing6 baa2 hau2
Pinyin sǐ shèng bǎ kǒu

Definitions (CC-CANTO)
  1. describes a person who is very argumentative, not admitting defeat despite not having anything solid to back it up; to describe someone who is good for nothing but only knows how to talk
Definitions (粵典–words.hk)
  1. 形容詞
    好識講​嘢​,​甚至​唔​係​好識​做​其他​嘢​,​只​係​識​靠​把​口
    to talk too much; One only knows how to talk but not to do other stuff; literally: all the body parts are dead, except for the mouth
    • 講嘢好叻又有咩用啫,咪又係死剩把口?
      讲嘢好叻又有咩用啫,咪又系死剩把口?
      What is the use of knowing how to talk? It's just bullshitting with no use.
  2. 參看
    死淨把口
Definitions (Kaifangcidian)
  1. 不服輸 – 不服输
Examples (粵典–words.hk)
  1. Cantonese
    讲嘢好叻又有咩用啫,咪又系死剩把口?
    講嘢好叻又有咩用啫,咪又係死剩把口?
    • What is the use of knowing how to talk? It's just bullshitting with no use.