The art form of which resides at most ska shows, such as ones not many people go to. You kick up yuor right foot then your left, alternatying as though you are running in place. As you do this, your left arm goes up when your right foot comes up, and respectively with the other foot. A perfect skank is also one that you may find at a more face paced ska show. Usually takes years to perfect.
HOLY SHIT DUDE!
That guy is skanking it up man! It's glorious!
Yea, thats Bobby. He's perfecto skankin' it.