fairy ring
n.— «Everyone who is accustomed to the country knows a “fairy ring” when he sees it. Each ring is only a belt of grass of a much darker green than that surrounding it.…If the grass of these “fairy rings” be examined in the Spring and early Summer, it will be found to conceal a number of agarics or “toadstools.”» —“Fairy Rings” New York Times Mar. 3, 1872. (source: Double-Tongued Dictionary)
Further reading
Need a slang term that can replace just about any noun? Try chumpie. If you’re from Philadelphia, you may already know this handy placeholder word. And there’s Queens, Brooklyn, Staten Island, Manhattan, and … The Bronx — why do we add...
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