skid-boarding
Boarding on one's own skidmarks.
You take a bunch of fresh skidmarks from your shorts and smear them on the sidewalk. Then you take a board, get a running start, and hop on the board as you slide upon your skidmarks.
"Damn! Did you see my homie straight up just beat the skid-boarding world record for longest skid-board?"
"Damn! Did you see my homie straight up just beat the skid-boarding world record for longest skid-board?"