Coal Rolling is an automotive subculture where people modify trucks to create large clouds of dark exhaust smoke under acceleration and then expel said smoke onto vehicles they deem inferior. Common targets include small cars, hybrid/electric vehicles and two-wheeled vehicles.
> ”Rolling coal is a form of conspicuous air pollution, for entertainment or for protest. Some drivers intentionally trigger coal rolling in the presence of hybrid vehicles (when it is nicknamed "Prius repellent") to taunt their drivers, who are perceived as being environmentally motivated in their vehicle choice. Coal rolling may also be directed at foreign cars, bicyclists, protesters, and pedestrians.”
Could you define that term for me?