bubba        
noun [ C ] US informal uk/ˈbʌb.ə/ us/ˈbʌb.ə/
 (用于向一个男孩或男人,特别是家中长子打招呼时使用)老兄,老弟
sometimes used to address or refer to a boy or a man, especially the eldest child in a family
  offensive美国南方未受过教育的白种男人 
a white, uneducated man from the southern US