Top Definition
A new phenomenon originating in Western Canada, a Diesel Bun is a dinner roll, hot dog bun or other like bread product placed in the exhaust pipe of a diesel-powered vehicle (usually a truck). It is consumed with the intent of becoming intoxicated from the vapors absorbed by the bun and is seen as a cost effective and nourishing alternative to huffing gas or smoking meth.
Before heading out to work in the morning, Richie always remembers to make a Diesel Bun in the exhaust of a truck in the Tim Horton's drive-thru. Washed down with a large double-double, its a great way to start the day (and corrode your internal organs)!
by Corey McCutcheon July 10, 2008

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