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1.
1. a person being notoriously good at something, but is the underdog of it; an urban myth of a rookie that shows up at the last second and slowly assasinates other competitors

2. a person who is a cerebral assasin
As in Skateboarding a McDiesel skater is Torey Pudwill

As in basketball a McDiesel player would be Mike Bibby

In Modern Warfare 2 a McDiesel would be a sniper in a distance that only gets headshots
by diggerdigger456 March 09, 2010
 
2.
Someone who is amazing at a sport or activity.
That guy is such a Mcdiesel at soccer.
by Buruski April 27, 2008