arenagist-jo-maniac
Someone who is obsessed with games or tv shows that invovles action in an arena. This includes games that do not require a game system such as Beyblade, which is spinning your blade agaist other blades in an arena.
Gamer #1 "Did you hear about that dude who played Quake Arena for ten hours straight?"
Gamer #2 "No, but he definitely is an arenagist-jo-maniac."
Gamer #2 "No, but he definitely is an arenagist-jo-maniac."