Top Definition
A person with a substantial level of knowledge and experience in the field of athletics and/or keeping fit.

Derives from the athlete Kelly Holmes, a British Olympic gold-medalist; usage popularised by the character Lauren from the catherine tate show.
Gym instructor: You're going very slowly on that treadmill.

Lauren: What do you know, are you Kelly Holmes?

Gym instructor: No, but...

Lauren: Are you Kelly Holmes?

Gym instructor: I'm only trying to hel...

Lauren: Are you Kelly Holmes?

Gym instructor: Just let me show...

Lauren: Are you Kelly Holmes?

etc
by Einar Stefanoffenson March 07, 2007

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