賊頭 [贼头]

Jyutping caak6 tau4
Pinyin zéi tóu

Definitions (Wiktionary)
  1. noun, Min-Nan
    bandit leader; bandit chief
    (syn.) 匪首, 賊首, 贼首
  2. noun, Taiwanese-Hokkien, derogatory, slang
    cop; police officer