Cowboy

Cowboy is a nickname for Daniel Brady, presumably because he is (a) from Texas and (b) "outrageously handsome":
 * Brady is an outrageously handsome blond with an exceptional physique. His team mates call him The Cowboy behind his back.

Also, Chaz Villette's mother Adeline Villette sometimes called Chaz "cowboy" - in particular, she did so as she lay dying of a heroin overdose:
 * It's okay, cowboy. Mommy just fell. I broke a glass.

Chaz sometimes refers to himself as "cowboy", especially when he feels he's screwed up somehow:
 * Okay, way to go, cowboy. Smooooth.
 * Whoa, cowboy. Pretty brown girl at home, remember?