A fag (Faggot -> Homosexual -> Uncool person) who plays Cod (Call of Duty -> Possibly the most overrated game of all time. Oh wait, Halo.)
Also a term for a player who TOTALLY NO-LIFES the game.
Kid: Lyk omfgg cod4 is liek teh besterest games EVAR
Nintend Fanboy/Halo Fanboy/WoW Fanboy: Lol codfag.
See Call of Duty 4