hammerhead
n.— «National competitions have developed since the first “hammerhead,” a self-descriptive term used among hardcore bikers, plunged downhill on a ski slope.» —“Mountain bikers are taking the plunge in the Carrabassett Valley” by Brian Swartz Bangor Daily News (Maine) June 15, 1995. (source: Double-Tongued Dictionary)
Further reading
A magnificent new book celebrates the richness and diversity of 450 years of written and spoken English in what is now the United States. It’s called The People’s Tongue, and it’s a sumptuous collection of essays, letters, poems...
A ballicater is a jagged wall of ice that forms on a frigid shore when pans of ice catch on rocks and slush freezes over them. A Canadian woman who grew up in Newfoundland says she’s warned never to go near one. Ballicater, spelled several ways...