地頭蛇 (dei6 tau4 se4) — someone who knows an area (or people from an area) particularly well in Cantonese
deiˍ₆地tauˎ₄頭seˎ₄蛇简 地头蛇
Mandarin Pinyin: di4 tou2 she2
Meaning of 地頭蛇
nounsomeone who knows an area (or people from an area) particularly well
nouna locally influential gangster; a local bully / villain / tyrant