Top Definition
A runner who runs ultramarathons - distances greater than a marathon (26.2 miles). Ultramarathon distances are most commonly 50k, 50 mile, 100k, and 100 mile. Runs can be both road and trail, but usually trail. Ultrarunners are extremely dedicated to their sport and have been found to be some of the most laid-back folks around. They tend to eat like horses, too. Most find them a wee bit eccentric.
Co-worker: "Uh, Jane?"
Jane: "Yeah?"
Co-worker: "Why are you wearing a camelback at your desk?"
Jane: "I'm fueling up for my race this weekend."
Co-worker: "Huh. A marathon?"
Jane: "My first 100."
Co-worker: "MILES?!?!"
Jane: "Yeah."
Co-worker: "That's crazy. I don't even like to drive 100 miles."
Jane: (shrugs and smiles) "I'm an ultrarunner."
by lagarius May 26, 2011

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