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The fecal river that cascades down ones legs during a run when no bathroom can be found. Usually the result of a Taco Bell feast or bad cheese. In the event of a runny mitch immediately take off your shoes and throw away your socks as things tend to pool up quickly.
Did you see Bob Blum today on the track, he had such a runny mitch.
by Fleazz March 03, 2017
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