tomb-stoning
n.— «The “tomb-stoning” youngsters, who are usually spotted diving off cliffs, have been leaping from a pier over the top of in-coming powerboats.» —“‘Bombers’ Dice With Death” Herald Express (U.K.) Aug. 5, 2003. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...