The act of operating a vehicle (preferably heavy machinery) while being modified physiologically in some manner by a drug or alcohol. Sometimes a minor haze, at best unconsciousness with limbs still moving spasmodically about while pretending to steer. Cause of such unique organizations as: "Women against Dead Husbands" and "How to kill yourself, in three easy steps" as well as "Jim the sailor can sail a boat while high on shrooms and LSD - he really can!"