講就兇狠，做就碌撚 [讲－凶－－－－－－]

Jyutping gong2 zau6 hung1 han2 ， zou6 zau6 luk1 nan2
Pinyin jiǎng jiù xiōng hěn ， zuò jiù lù niǎn

Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic, vulgar
    all bark and no bite; powerful on one's words, a fool on one's actions