BRO Meaning of BRO in English bro /brəʊ $ broʊ/ BrE AmE noun ( plural bros ) [countable] spoken [ Date: 1600-1700 ; Origin: brother ] 1 . your brother 2 . American English a way of greeting a friend Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012