地頭蛇 [－头－]

Jyutping dei6 tau4 se4
Pinyin dì tóu shé

Definitions (CC-CEDICT)
  1. local bully
  2. tyrant
  3. regional mafia boss
Definitions (粵典–words.hk)
  1. 名詞
    指一個​人​好​熟​一個​地方​，​知​清楚​晒​呢​個​地方​嘅​人​、​事​、​物
    someone who knows a particular area well, someone who have detailed local knowledge; literally "local snake"
  2. 近義詞
    地膽、地頭蟲
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    local bully; peremptory or tyrannical local