a form of clothing. more formally known as a tank top, these articles of clothing are also made reference to the ones rednecks wear, hence getting the name wife beaters.
now that it has been shown that chris brown beats women, we are forced to conclude that a chris brown is the same thing as a wife beater.
guy 1: "whatcha wearing"
guy 2: "guess"
guy 1: "I dunno, a wife beater?"
guy 2: "no, a chris brown"