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Someone who knows everything there is to know about sports but gets almost no physical activity in his/her life; their main past time is playing in fantasy sports pools on the internet.
Normal human being: "Dude, wanna go do some midget tossing?"

Fantathalete:"No way man, I've got to catch up on my fantasy pools. I've got a draft starting in 25 minutes."

Normal human being: "Dude, we're playing against hot Las Vegas strippers and they'll be naked."

Fantathalete: "Sorry dude; if i don't start the draft on time the world around me will crumble."
by Norman Peabody October 21, 2006