Someone who:
-Considers Rockstar Games' Grand Theft Auto series to be their favorite game series of all time.
-Owns every GTA game (1, London, 2, III, VC, SA, LCS, VCS).
-Has beaten at least one of the games 100%.
-Has a complete hatred for every game considered a "GTA clone", and will attempt to murder anyone claiming games such as True Crime, Driver, Saints Row, and Mafia are better than GTA.
-Tries to minimize their social life as much as possible, to play more GTA.
-Loves watching news broadcasts and documentaries about how GTA is corrupting the world, because it gives them the urge to go play.
-Doesn't just like the 3D games. They also have an appreciation for the original 2D games.
-Bought a PSP specifically to play Liberty City Stories.
-Is planning on getting/has gotten an Xbox 360 or PlayStation 3 to play Grand Theft Auto IV.

In short, me, and thousands of others.