老黃牛 [－黄－]

Jyutping lou5 wong4 ngau4
Pinyin lǎo huáng niú

Definitions (Wiktionary)
  1. noun, literally
    old or large ox
  2. noun, Mandarin, figuratively
    diligent and conscientious person
  3. noun, Shanghainese-Wu, figuratively
    one who is irresponsible; flakey person
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）