A gauge to indicate how much of a douchebag you are .It can be correlated in some way to the yolo-o-meter.
An urban legends say that it is actually a gay-o-meter, but c'mon guys, only Bender (from Futurama) has that kind of item.
Some say that if you take the inverse of the number, you can estimate the grade the guy will have in High School.
John : Yo man, I got 95 on the swag-o-meter, so fucking swag!!!!!
Ronald : Hey me too three years ago, welcome to McDonald!!!! ;)