n. downhillskateboard, usually built very heavy duty measuring 40-43" with wheel cutouts for large wheels. often mounted drop-through, with the truck baseplate mounted on top of the board.
v. downhillskateboarding, where riders use aerodynamic tucks and crouches to reach speeds as high as 65mph, drifting their boards at turns and footbraking, airbraking, or sliding to stop.
n. I just got a brand new speedboard! I can't wait to bomb some hills!
v. Hey, do you want to speedboard today? I found a nice hill over by the school.
n. skateboard or surfing trick where rider makes a quick 180 degree heelside turn using their front hand as an anchor on a wave or a banked piece of pavement while grabbing the toeside edge of board with the free hand.
Did you see him do that sick bert? It was like he was surfing concrete!