bombing
n.— «They have no headlights, tail lamps or turn signals. No steering wheels, seat belts or seats. No brakes. Yet they travel at speeds reaching beyond 40 mph on public streets and highways. They’re oversized, low-profile skateboards designed for high-speed, downhill runs on pavement. In skateboarder parlance, the practice is known as “bombing” hills and the boards are called “longboards.”…A skateboarder died early Wednesday morning while “bombing” a steep section of Eastdell Drive in Sandy. His longboard struck a manhole cover and his head hit the pavement.» —“Longboard bombers: Cops need to curb skateboarders” Salt Lake Tribune (Utah) July 20, 2007. (source: Double-Tongued Dictionary)