老差骨 [－－－]

Jyutping lou5 caai1 gwat1
Pinyin lǎo chà gǔ

Definitions (粵典–words.hk)
  1. 名詞、俚語
    當​咗​好多年​差​嘅​人​；​年資​高​嘅​警​員​（​量​詞​：​個​）
    an experienced police-officer; a seasoned veteran in the police

老差骨 [－－－]

Jyutping lou5 caai1 gwat1
Pinyin lǎo chā gǔ

Definitions (CC-CANTO)
  1. experienced policemen (slang)