high-marking
n.— «Did a practice called “high-marking” cause the avalanche that killed two Iowa men? Witnesses say the men were competing to see who could drive their snowmobile farthest up a hillside near Rocky Mountain National Park in Colorado.» —“Avalanche Kills Two Iowa Men” in Colorado KCRG-TV (Cedar Rapids, Iowa) Jan. 3, 2006. (source: Double-Tongued Dictionary)