Duty fag
A person (usually male) that, for the most part, only plays Call of Duty, Battlefield, or any other cloned FPS. These people often tend to view other video games as "nerdy". This term mostly relates to people you would refer to as "fuckboys". Often times these are the more popular people.
I hate Duty fags; they ruin the gaming title for everyone! And what's even worse is that everyone but Duty fags gets made fun of for playing video games!