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Term used to describe when a diesel engine is blowing a thick cloud of black smoke. Also common with yuppie teenager's who have there parents pay for a nice diesel truck and then put a chip in it to blow smoke.
"You should have seen that truck it was rolling coal like crazy."
by popsicleishous February 18, 2009
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Rolling coal is the act of modifying a diesel engine to supply a rich fuel mixture. This produces large black plumes of smoke. Sociologists have studied the connection between inbreeding and the modified diesel engines for many years.
The act of rolling coal has come to be known as a celebration in the United States as the love and commitment you share with your family.
Jimmy was proudly rolling coal while leaving the outskirts of the trailer park with his sister on his lap.
by Sethxy July 24, 2017
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Laying down a long fart while ascending an escalator. Preferably done after saving your farts for as long as possible to maximize emissions of fecal particles.
Damn dude, I'm taking the stairs. That guy on the escalator was rolling coal.
by Bonne Mamman's Bench December 14, 2015
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