A game which is so brill you loose track of time and you eyes go all baggy after playing it all day
Mum: Aren't you having your breakfast?
Kid playing on Sims 2: ...
Mum: Aren't you having your lunch?
Kid playing on Sims 2: ...
Mum: Dinner???
Kid playing on Sims 2: When's breakfast???
(it's trying to say that the kid lost track of time)