arse-grass
n.— «They sported glittering head-dresses made from bird of paradise feathers, and round their waists they wore grass kilts, known somewhat cheekily in Papua New Guinea’s Pidgin English as “arse-grass.”» —“Deadly twist to PNG’s tribal feuds” by Nick Squires BBC News Aug. 25, 2005. (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...