【喻】【谑】第一把手；最强的人。喺呢度我系一哥（在这儿我说了算。）│佢乜都想做一哥。（他在甚么事情上都争强好胜。）

(slang) a leader or a chief of a group; often specifically a reference to the Commissioner of Police in Hong Kong, who is the head of the Hong Kong Police Force; a term to describe someone who is the most capable or particularly talented within a specific field