Earlier quoted context omitted.
An electronic version of coal rolling. "You can't tell me this is unhealthy, and I'm going to prove it!"
People "roll coal" it because it is kinda amusing to do it, and it is a middle finger towards people they perceive to be preachy. I accidentally "rolled coal" in my 90s Landrover because I was in totally the wrong gear going up a steep hill. It was amusing in the way of "oh shit! I kinda just blew a load of black smoke in the driver face behind me". Obviously, I don't do this deliberately.
Incredibly childish. "I hate you for saying we should have a cleaner environment, so I will intentionally pollute the environment!"
> I accidentally "rolled coal"
There is no accidentally rolling coal. You just had shitty emissions. Coal rolling is intentional, and requires a special tune at the very least.