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The combined action of yelling "KNUCKLE, KNUCKLE, KNUCKLE" at the top of your lungs, while jumping all around and throwing your hands in the air with your fists clenched and an angry, rabid look in your eyes.
Dude wouldn't move over on the single track so I had to pass him and then stop in the middle of the trail to do the knuckle dance.
by DeCarlo, et. al June 11, 2009