Some one who plays a Online game and excludes everything else. Often used to describe when some one has a lot of time to spend in a online game.
Came from a article in a newspaper on Everquest. The player they interviewed played so much Everquest he forgot to change his cats littler box, leading the reported to comment his house smelled like "a cats ass".
Not every one has enough time to catass foir items in Everquest.
That guy is such a catass, he has been at the same spawn for 9 hours straight.