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A skateboarding maneuver performed in a pool or pipe, where the rider accidentally steps on the front of the board in front of the trucks, causing the board to fly up and hit him or her in the buttocks. This must be followed by a vehement denial that the board hit you in the butt.
"dude, that was an awesome buttwhack rollout"
by professor fartsinpants March 01, 2009
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