1 definition by IchiNiSanShi

Top Definition
A run that is particularly fun. It can be an enjoyable path to run on or a run that really challenges you. Runners in the San Diego area and particularly ones at San Dieguito Academy use this term to describes running routes.
Brendon: Hey guys, lets run ten miles today!
Everyone: No way. Let's do a frun. How about a two mile loop to the beach that's a frun.
by IchiNiSanShi October 31, 2009

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