Heard most commonly in the Beyonce song "Drunk in Love", Surfbort is a sexual position where a male lays in the tub with his knees bent. The woman straddles him with her back towards him so she can ride his dick by holding onto his thighs, much like holding onto a surfboard and bobbing through the ocean.
"Fill the tub up half way and ride it with my surfbort but with smurfs."

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