chug-wagon noun1 •(slang, no longer used) An early motorized vehicle for driving on land (such as an automobile, truck, tractor or steam-powered railway multiple unit), especially a car; horseless carriage.While the “chug-wagon” business is good, it is not probable that farm wagons, trucks, etc., will assume a very heavy demand until harvest time. — 1913 formschug wagons · chug-wagons