Rolling coal is the practice of installing a tampering device to pump more diesel into a vehicle’s engine than it can handle, leading it to spew out sooty black clouds of exhaust that pollute the air.

The practice is sometimes used as a form of anti-environmental protest. Coal rollers, or the drivers who engage in the action, may intentionally target Teslas, Priuses or other electric or hybrid vehicles.

Some people's dedication to being an asshole is quite astonishing. Imagine paying money just to be able to spew soot at other people's electric cars.