冇牙佬飲湯——無齒下流 [－－－饮汤－－无齿－－]

Jyutping mou5 ngaa4 lou2 jam2 tong1 — — mou4 ci2 haa6 lau4
Pinyin mǎo yá lǎo yǐn tāng —— wú chǐ xià liú

Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    to be vulgar and know no shame