Toy.
Played for enjoyment, entertainment, to pass the time with. Nothing wrong with a toy mind you, awful fun things they be, so don't take it as an insult as it's not one at all. A football is also a toy, but I still love my favourite FCs.
I do not consider video games a sport. Mind you I also don't consider horse riding a sport unless you are a horse, racing around a big circle in a car, nor being a hooligan. Video games can have exercise in them however which is good.
While I consider video games, like any visual and audio showing, an artistic medium. I don't consider video games by themselves or as a whole art. There is some amazing audio, visual, cinematic, and interactive art to be found though.