橫行無忌 [横－无－]

Jyutping waang4 hang4 mou4 gei6
Pinyin héng xíng wú jì

Definitions (CC-CANTO)
  1. to be lawless; to run wild; to run amok
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to run amuck; to run wild