Coalroller

A coalroller is typically a truck that spews black smoke out of (usually a smokestack like on semis) it's exhaust under the guise of a backwater hick saying, " it's the diesel that does it!" Like the word suggests, it's not actually diesel that causes this black death cloud; it is, in fact, coal dust.

"Yo Jack, is there a house on fire here?"
"No, Jim. It's some asshole driving his coalroller down the road."

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