I always considered an idle game to be a game that you can mindlessly play to pass time. Waiting at a doctor's office or on a bus ride to/from some place come to mind.
But if we're using a different definition, I'm sorry :'(
Well, theres only one definition for an idle game. You should play a few to understand what they are about. Basically an idle game is a game that requires very little interaction for long periods of time. obviously joking about the -10 points thing.
