半路殺出個程咬金 [－－杀－个－－－]

Jyutping bun3 lou6 saat3 ceot1 go3 cing4 ngaau5 gam1
Pinyin bàn lù shā chū ge chéng yǎo jīn

Definitions (Wiktionary)
  1. phrase, idiomatic
    someone or something unexpected appears and disrupts the matter

半路殺出個程咬金 [－－杀－个－－－]

Jyutping
Pinyin bàn lù shā chū gè chéng yǎo jīn

Definitions (CC-CEDICT)
  1. lit. Cheng Yaojin ambushes the enemy (saying)
  2. fig. sb shows up unexpectedly and disrupts the plan
  3. sb whose presence is regarded as irksome