cushion
n.— «Cushion—Clay that piles up in the corners from the sliding cars. Those who prefer to run on the outside of the track can use this to push off and zip down the straightaways.» —“Learning the Lernerville lingo” by Paul Kogut Valley News Dispatch (Tarentum, Pa.) May 14, 2004. (source: Double-Tongued Dictionary)
Further reading
People who hunt treasure with metal detectors have a lingo all their own. Canslaw means the shreds of aluminum cans left after a lawnmower ran over them. And gold dance? That’s the happy jig you do if you find something far more valuable than...
