Cytie (pronounced "city") is an acronym for "Causes You To Ignore Everything".
It's used to indicate the level of involvment a game creates. Do you get so caught up in the game that you lose track of time? Don't hear your phone ring? Forget dinner cooking on the stove?
I had to explain this to a group of digital immigrants. They discussed it for awhile and decided that it meant what happens when "you read a book" and lose track of time. But at least it translated.
yeah, same thing really. Doesn't matter what it is.. good book, good game, or even a really good movie... something can pull you in enough that all your focusing on is that one thing.