dirt diving
n.— «Tucked away on a long driveway, just after a donkey farm, is Vermont Skydiving Adventures (VSA).…Last Friday, four regulars were “dirt diving,” the term for practicing maneuvers on the ground. They were planning on “turning pieces”—doing complex four-person moves in formation in mid-air.» —“Nothing but blue skies” by Phyl Newbeck Burlington Free Press (Vermont) June 6, 2008. (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...