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Jyutping wong4 maa5 kwaa2
Pinyin huáng mǎ guà

Definitions (CC-CANTO)
  1. one with special power or authorisation (slang)
Definitions (粵典–words.hk)
  1. 名詞
    清朝​皇帝​賜​俾臣​下​嘅​黃​色​騎​馬​用​短衣
    yellow riding jacket granted from the emperor
  2. 名詞
    比喻​一個員​工同​老​闆​係​親屬​或​朋友​關​係​,​因而​得到​特權​或​特別​待遇​。
    figuratively an employee who is privately related to the boss, an employee who enjoys the special favour of the boss
    • 呢間公司高層個個都係黃馬褂,你呢啲外人想升職都幾難。
      呢间公司高层个个都系黄马褂,你呢啲外人想升职都几难。
      ni1 gaan1 gung1 si1 gou1 cang4 go3 go3 dou1 hai6 wong4 maa5 kwaa2, nei5 ni1 di1 ngoi6 jan4 soeng2 sing1 zik1 dou1 gei2 naan4.
      Every high level staff of this company are all related to the boss, an alien as you is nearly impossible to promote to that level.
Definitions (Wiktionary)
  1. noun, Cantonese, figuratively
    employee who is related to the employer and has special privileges by association
  2. noun
    imperial yellow jacket
Examples (粵典–words.hk)
  1. Cantonese
    呢间公司高层个个都系黄马褂,你呢啲外人想升职都几难。
    呢間公司高層個個都係黃馬褂,你呢啲外人想升職都幾難。
    ni1 gaan1 gung1 si1 gou1 cang4 go3 go3 dou1 hai6 wong4 maa5 kwaa2, nei5 ni1 di1 ngoi6 jan4 soeng2 sing1 zik1 dou1 gei2 naan4.
    • Every high level staff of this company are all related to the boss, an alien as you is nearly impossible to promote to that level.