Well lets see, there is
-Mouse-kateer (as in computer mouse, not the disney mouse)
-Soldier of Fortune subscriber
-Cereal Killer (capt'n crunch, yum yum)
-Coke can killer (a person who shoots cans with a BB gun and assumes he's a master sniper)
- Member of the Playstation Platoon (for all those folks who thinks playing Modern Warfare suddenly makes a person into a ballistics/ camoflage/ weapons/ tactical master)
Umm....I think that's all I got. After that it gets prettymuch into the generic terms like "idiot", "jaggoff", "tool", etc.