bonk
v.— «This is because such exercise will quickly deplete the body’s reserves, causing severe fatigue (in running this is called hitting the wall, in cycling it’s known as the bonk, which is the sound you make when you hit the wall).» —“Cyclist’s Challenge: Turning 100″ by James McNamara Washingon Post Aug. 15, 1986. (source: Double-Tongued Dictionary)