COD chump
Noun-a person with an excessive obsession with Call of Duty. They think it's the be all/end all of FPS's and will defend it's honour to the bitter end even though it's really just like any other FPS ever made.
Person A: COD is soooooooooo amazing! Greatest game eva!
Person B: You're such a COD chump.
Person B: You're such a COD chump.