Ok, so basically, an epic one is this really chill, kind, legit, confident, talented, epic, brilliant, funny, legendary person who is just the best possible human being ever. They are rare and wonderful, take care of them, you may only find one in your life time. I would know, I'm the "epicone" I know.
Dude: Pretty damn awesome person over there.
Other dude: You could say she's an epic one.