One who brings a surfboard to the beach even though they don't surf. Bro Diegans are often observed traveling a high rates of speed down the 5 freeway in their used BMW's. They frequently reek of Axe and are generally considered douche bags. The most dense population of Bro Diegans can be found in the Gaslamp district getting hated on by a tall man named Matt.
That Bro Diegan is a douche bag.
by Dick Waterfall February 08, 2009