roll coal 

the act of rollin' coal. When you have a tune on your diesel truck or have turned up the injection pump and you mash the throttle overfueling the engine until the turbo spools up, producing a large cloud of thick black smoke. Its fun to do, but you can't go around doin it all the time as enviromentaists hate us enough already

Did you see me roll coal all over that group of enviromentalist protesting the diesel truck lot?

roll coal by 05_PSD July 30, 2009

Roll Coal 

Originally a term used to describe the act of blowing thick clouds of smoke from a specially tuned diesel pickup truck, but has recently been reappropriated to mean taking a big ol' dookie.

I'm sorry, but I'm going to be late to the 11 o'clock. I had a beefy burrito breakfast and have to roll coal.

Roll Coal by internetboy December 22, 2021

roll the coal 

Turnning up the injection Pump on a Diesel engine making it Smoke alot.

"roll the coal" or "rolling the coal" is hitting the gas to smoke someone out behind you, or to just make alot of smoke. smoke=horsepowe in Diesels

roll the coal by Rudolf Diesel December 13, 2006