a stupid person or someone who is behaving in a stupid way
Some buttwhack left the tap running in the bathroom and there's water everywhere.
as form of address You buttwhack - that's a month's work you've lost!
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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"