Take a drink for every use of the word "mature".
When I say "mature", I don't mean mature as in the ESRB rating. It seems that the word "mature" can be thrown around to refer to content (be it story-telling, imagery and so on) that is adult. In the case of violence, take Mortal Kombat as an example. While it's gore and violence give it the appearance of a "mature" game, it's not really seen as one. It's over-the-top violence has been called childish in the past. Which isn't necessarily a knock against it. It's just not "mature".
So I ask the Giant Bomb community, what is a "mature" video-game? When I try to think of an example, Spec Ops: The Line comes to mind. That game tries to criticize you for expecting it to be a power fantasy. Explaining that the horrors of war is something that has been dealt with in a juvenile way in most games, creating a expectation when going into that sort of game. But what makes it mature? Is it the dark, grimace tone? The "real" depiction of violent actions?
Perhaps the word mature is too easily thrown around as a quip when talking about violent games.
"Call of Duty isn't mature".
"This game that I like is much more mature, and therefor cooler"
"Stop playing your kids games. I'm an adult because I play mature games".