Top Definition
A run (or other form of exercise) at the end of which cake is eaten, leading to neither a net loss nor net increase of calories.
Gary: Hey, why are you eating that humungous slice of cake?

Noel: I'm just finishing off my calorie-neutral run. 5 miles of running = a humungous slice of cake.
by geekinthepinkypink September 25, 2011
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