Boofing
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In whitewater kayaking, boofing refers to the raising of the kayak's bow (see Bow (ship)) during freefall, while descending a waterfall. This technique is used to avoid submerging the kayak by ensuring it lands flat when it hits the base of the waterfall. The term is believed to be an onomatopoeia derived from the sound that is sometimes created when the hull of the kayak makes contact with water at the base of the waterfall.
Timing is critical to properly execute a boof. The final stroke coming off the waterfall should be close to the lip and relatively powerful, in order to force the bow of the boat up.
A boof may or may not be appropriate, depending on the anatomy of your selected waterfall. Generally, if it's shallow at the base, you should boof to avoid pitoning. Waterfalls higher than about twenty feet should not be boofed, because doing so may cause spinal injury.
- MCA HUT! Archive: Boof Is What? (full definition and etymology)