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Jyutping sei3 mei2
Pinyin sì wèi

Definitions (CC-CANTO)
  1. four types of sexual services, foot licking; fellatio, anilingus and sexual intercourse [colloquial]

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Jyutping sei3 mei6
Pinyin sì wèi

Definitions (CC-CANTO)
  1. four types of flavours [written and colloquial]