What is a good xbox 360 gamertag name when you want to show how good you are

If you mean about just a certain game, then use something like "Halopro", or "GearsofAwesome". Just anything like that really. or if you're just amazing in general, "Ipwnnoobs" is good or "MebeatYou" or "HaHaULose". Think of an in your face statement that you would say to your friend if you beat him, and use that.