抵你生仔冇屎忽 [－－－－－－－]

Jyutping dai2 nei5 saang1 zai2 mou5 si2 fat1
Pinyin dǐ nǐ shēng zǐ mǎo shǐ hū

Definitions (CC-CANTO)
  1. an expression used to curse someone's children to be born without a bottom and that they deserved it if the curse ever comes true [colloquial]