boof, a common slang term for anal sex (butt fuck)
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A boof is just a wheelie done in a boat- you reach forward for a powerful stroke, and as your stroke passes your hips, you thrust your hips forward and then while still stroking with the paddle, sit up and lift your bow.
Of course, the major difference between boofing and doing eddy turns is that the former involves a bit of verticality, and in most cases lunging your hips is not an option, it's mandatory.
You finish the boof by sitting aggressively forward and lifting your bow, and preparing for a landing in a forward position.
The Rock Boof Wheelie is a technique that can be done off of any drop that has the right kind of rock at the lip of the drop where the boof needs to be done.
The rock boof is different than a normal boof off a drop because the rock boof uses the rock to ramp your bow into the air, when in a normal boof there is a deliberate bow lifting powerful boof stroke used to lift the bow into the air.
With a rock boof the most important part of the move is to powerfully drive up on the rock like it is a little ramp on the river.