(slang) infighting; internecine conflict of the people involved; quarrel among a group internally; falling out amongst villians
Definitions (粵典–words.hk)
語句
內鬥、內亂；同屬一個組織或者群體嘅人，互相攻擊、爭執，尤其是係個群體本身唔受其他人歡迎嘅，例如黑社會之間毆鬥 the in-fighting, fighting or quarreling among members of the same group, literally "ghost fighting ghost"