whoop n. (also whoop-de-do) a bump or undulation in a trail used for riding or racing motorcyles, bicycles, or motorbikes. (source: Double-Tongued Dictionary)
Further reading
As a Wyoming caller noted in an earlier episode, through-hikers on routes like the Appalachian Trail give each other trail names — jocular appellations that stick throughout their trek. The origin stories of several of these are told in the book...
Jean in Thetford, Vermont, remembers using the term cherry bump to refer to that moment when part of a backyard swingset leaves the ground for a moment, then lands with a thump. Another term for it is cherry bomb, which can also be used for a...