A scale that measures the amount of "g" or gayness of a person or action. The g scale has no quantitative units of measure as "g" is a purely subjective measure. On a cartesian grid, higher "g" is up and towards the right. The g scale is most commonly used to compare two items with regards to "g" as in wearing a pink shirt is not as high on the scale as shoveling your walk in a banana sling and flip flops. It is also used to denote a high "g" by stating that something is on the scale.
That last policy memo from the boss was on the g-scale.
Liberace, Broke Back Mountain, and Senator Larry Craig show progression along the g scale.