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Jyutping sei3 sei3 seng1
Pinyin sì sì shēng

Definitions (粵典–words.hk)
  1. 名詞
    形容​「​四​」​字同​「​死​」​字​諧音​,​暗示​講者​唔​鍾​意​「​死​」​嘅​意思
    used for describing the similar pronunciation between 'four' and 'die', implying the speaker does not like talking about 'four' due to this connection
    • 四四聲唔好聽
      四四声唔好听
      sei3 sei3 seng1 m4 hou2 teng1
      talking about four is ominous
    • 阿媽話唔鍾意住十四樓,四四聲唔好意頭喎!
      阿妈话唔钟意住十四楼,四四声唔好意头㖞!
      aa3 maa1 waa6 m4 zung1 ji3 zyu6 sap6 sei3 lau2, sei3 sei3 seng1 m4 hou2 ji3 tau4 wo3!
      My mum does not like living on 14th floor because the pronunciation of 'four' is similar to that of 'die', which implies bad luck!

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Jyutping sei3 sei3 seng1
Pinyin sì si4shēng

Definitions (CC-CANTO)
  1. the sound of 'die die' all the time (the sound of 四 sounds like '死'die') [colloquial]
Examples (粵典–words.hk)
  1. Cantonese
    四四声唔好听
    四四聲唔好聽
    sei3 sei3 seng1 m4 hou2 teng1
    • talking about four is ominous
  2. Cantonese
    阿妈话唔钟意住十四楼,四四声唔好意头㖞!
    阿媽話唔鍾意住十四樓,四四聲唔好意頭喎!
    aa3 maa1 waa6 m4 zung1 ji3 zyu6 sap6 sei3 lau2, sei3 sei3 seng1 m4 hou2 ji3 tau4 wo3!
    • My mum does not like living on 14th floor because the pronunciation of 'four' is similar to that of 'die', which implies bad luck!