look up any word, like demisexual:
 
1.
Pronunciation: \ˈshād-dəl\

Transitive verb: to keep the clutch partially engaged while accelerating with the gas pedal as a driver changes gears on an automobile with a manual transmission. This action causes an excessing revving of the engine and is often accompanied by laughter directed at the driver from others in the vehicle.

Etymology: German surname Schadl
As Jason struggled to shift smoothly from second to third gear in his aging 5-speed Honda Accord, Janice and Sarah roared raucously over the sound of the revving engine, "He shadled the clutch again!"
by Jayse326 August 17, 2009