The act of hauling ass on your skateboard and slapping it into a curb at an angle that gets you on top of it and grinding. There are many variations but a true slappy involves speed and grinding...John Lucero, Ricky Winsor, Natas Kaupas and many others are known slappy legends.
Dude..go grab a twelve pack and we'll do slappys on that red curb.
Riding down stairs on your wheely board. Most people think it's pretty easy. Then again, most people can't stand on a skateboard.
Hey look! A stair set! SLAPPYS!