rollin coal is a redneck high school term used for idiots who thin its cool to over-heat there turbo and redneck rig there diesel( cummins "smoke screw" , smoke switch) to blow the most black smoke from there exhaust as they possibly can. there is no point to roll said coal if you want smoke do it right and do injectors intake turbo and chip and smoke will come as a by product but keep it off the road. Those coal rollers are why diesel has so many emmisions restrictions.
"hey you see that idiot rollin coal all over that guy on a motorcycle?" " yeah look at that cop pullin him over"
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