洗定個八月十五 (sai2 ding6 go3 baat3 jyut6 sap6 ng5) — prepare yourself for jail!; see you in jail [colloquial] in Cantonese
saiˊ²洗dingˍ₆定go˗₃個baat˗₃八jyutˍ₆月sapˍ₆十ngˏ₅五简 洗定个八月十五
Mandarin Pinyin: xi3 ding4 ge4 ba1 yue4 shi2 wu3
Meaning of 洗定個八月十五
nounprepare yourself for jail!; see you in jail [colloquial]