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)
whoop n.— «Two weeks ago I listened while Karolyn and Julia talked about the steep downhill and the series of “whoops” at the beginning of the trail. “Whoops” are like moguls in downhill skiing, they are mounds...