dude read in snowboarder mag in trick tips, i think it was like mikey leblanc that did it on a rial and when he hit the ground he 'prezeled' aka spinning buttering on the ground
its prolly called a pretzel in boarding cuz whoever does it has to twist up and shiz to get the right spin, cuz they dotn have 2 sets of edges to help reverse the direction of the spin. i think it should be called something better than pretzel for skiing, like, reverse 270 out... if pretzels even a term in boarding, i dunno...