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a 4x400 meter race in which every time you get to the 400m mark you stop and eat a donut. you continue this until everybody but one person throws up, and you have a winner. Common with cross country and track runners, but not affiliated with the beer run.
Person 1: That was a fun donut run yesterday

Person 2: I feel bad for the person that has to clean that mess up
by Scott dfnidfgnusdn December 20, 2005
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