(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
Definitions (粵典–words.hk)
名詞
香港警務處長嘅暱稱 nickname of the Hong Kong Commissioner of Police
名詞
一間公司、一個部門、一個組織入面地位最高嘅男性 the male who has the highest position in a company, department or organisation
名詞、術語
巴士術語，泛指樣版車，或車隊編號系列排第一嘅巴士 (bus) prototype or the first bus in a fleet number series.
Definitions (Wiktionary)
noun, colloquial
top-ranked male; leader
noun, Cantonese, Hong-Kong, colloquial
Commissioner of Police of Hong Kong
Definitions (Kaifangcidian)
第一名
最出色的人
最大的人
最有本事的人
老大
頭 – 头
第一把手
警務處處長 – 警务处处长
Examples (Tatoeba—Mandarin-English)
Mandarin
我一哥们儿他爹是变戏法的。
我一哥們兒他爹是變戲法的。
wǒ yī gē men er tā diē shì biàn xì fǎ de 。