Some one who only buys mainstream games from game stop and only game stop. This person only plays mainstream games because in their eyes, only mainstream is cool. They only use Console platforms. (Xbox, PS3) They hold all mainstream shooters in high regards.
Gamestoppers love Call of Duty and Halo
Antonyms - Hipster
Ex1. - Billy is such a gamestopper, all he does is play Call of Duty because everyone else is playing it.
Ex2. - Billy wont even try <insert non mainstream game here> because hes never heard of it before. He says it has sub-par graphics so it must be a bad game.