A person with traits similar to both a "bro" and a "hipster." Some of the traits they will assume are a defensive attitude, terrible tastes in music, tv, and music. There cigarette of choice is "Newps." Also there appearance will shift between high sports apparel and standard hipster gear.
Note: Beware, depending on their mood brosters can be very violent when called brosters.
Janet, I'm sorry to say this, but your roommate Clarissa is becoming such a broster, we can't hangout with her anymore.