slam draft
n.— «It’s called “slam drafting,” and it has nothing to do with slamming draft beers every time Dale Earnhardt Jr. crosses the start-finish line. A slam draft is a more violent variation of the bump draft drivers use to give the car in front of them an aerodynamic push. Gordon said he was hit so hard during Saturday’s Budweiser Shootout that he started leaning his head back against the seat to avoid whiplash.» —“Daytona suddenly the site of grand ‘slam’” by David Newton in Daytona Beach, Fla. The State (Columbia, S.C.) Feb. 17, 2005. (source: Double-Tongued Dictionary)