A casual gamer is a misconstrued word (often moronically) whereby anyone who plays Sports games or is a supporter of EA are deemed casual. However, this is incorrect.
Casual gamers are gamers that can only find the time to play games every so often and when they feel like it. They don't feel the need to play daily or weekly. Often it's "harcore" gamers that like to use the term casual as an insult and these are the one's who are truly pathetic.
OMG's! dat H4rdcor3 GamerZ just called me a casual gamer as an insult. He must get Laid a lot!