tombstoning
n.— «They were among a group of six who were “tombstoning” at Stoke Point near Wembury—which involved leaping off Tombstone Rock into the sea below.» —“Ice Demand ‘Unprecedented’ As Britain Carries On Sweltering” by Shenai Raif Press Association (U.K.) Aug, 2, 1995. (source: Double-Tongued Dictionary)
Further reading
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...
To joner means to “bring bad luck to” or “jinx.” This term is a corruption of the name Jonah, the biblical figure who initially resisted a divine command. His presence on board a ship supposedly caused a great storm at sea...