I think the term casual literally means people who play games but don't consider it a hobby. because of this, they will only buy games like CoD, since there are a lot of people like this, CoD gets a lot of sales, which makes good franchises like Bf and ME to copy the tactic and dumb down the game to make it more accesible. The gamers who consider it a hobby and play everyday, see these 'casuals' as a group that is ruining their experience, because companies aren't delivering long expansive games single player games (Like skyrim) and are instead, taking control away from the player and adding unnesarasary multi-player (Like Mass effect 3).
This is what I think people mean when they say casual, and if it is the you are not a Casual Op, not that I care anyway because It's not exactly a bad thing to have a life.
[Edited on 11.29.2012 8:36 AM PST]