Top Definition
A long run comprising of 18 miles or more done purely for the sake of enjoying the scenery and environment of where the participant is running. Popular amongst high school and college runners in the Western Pennsylvania distance running community, it was created by the great American Distance Runner Timothy O'Mara.
"Hey did you run an O'Marathon Today?"
"I'm going to run an O'marathon across a glacier, it looks very scenic."
by McLovin' August 25, 2007

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