I needed to ask ChatGPT to understand you :-) "Rolling coal" is the practice of modifying a diesel engine—usually in pickup trucks—to increase the amount of fu

I needed to ask ChatGPT to understand you :-) "Rolling coal" is the practice of modifying a diesel engine—usually in pickup trucks—to increase the amount of fuel entering the engine, which causes the vehicle to emit large, thick plumes of black smoke from the exhaust. This is often done by tampering with or removing emissions control devices.