"Gettin' it" is used to describe anyone doing anything. As long as this thing is being done in a matter that is "hard as fuck".
One who is "gettin' it" cannot be criticized, because they are having one hell of a good time. However, while "gettin' it" you may look foolish.
When a group of people is really "gettin' it" look to join in on the fun.
Guy 1: Damn, do you see that guy dancing over there.
Guy 2: Yea, dude looks life a fool.
Guy 3: He's going hard as fuck though.
Guy 1: Yea, he's gettin' it!