(noun) A small subsect within the ever-pathetic bro epidemic. These bros call the dairies of Chino, Norco, small parts of Corona and Chino Hills their home.
Not to be left out, young boys and girls who grew up on dairies enfuse a dairy-esc hooligan style to the bro image. Contrary to popular bro-dom, these cowbros seldom grew up in suburbs. This gives them a tinge of badass-ness that overshadows that of most bros.
For example, cowbros' raised trucks are often dirty, a symbol of accomplishment. These bros actually attempt use their ridiculous trucks. Furthermore, their trucks will often be seen modified greatly with flared fenders, an unevenly raised front axle, and a truck bed which proudly shows a spare tire so big, a door cannot fit, thus rendering the truck bed all but useless.
Though a small splinter from the bro sect, cowbros still look like bros, talk like bros, act like bros, and think like bros.
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The Chino High football game was overrun with cowbros.
Biff's fenders are so high. I can't compete with that. He's the sultan of cowbros.