Since this site is devoted to becoming ‘epic’, it stands to reason that defining what we mean by ‘epic’ would probably be a good place to start.
The popular definition of what constitutes ‘epic’ varies considerably, and not of all of the definitions are necessarily positive (epic fails come to mind as a good example). I think what best sums up the popular definition of ‘epic’ would be ‘performed in a way that is impressively great, noteworthy, unique or to an extent well exceeding what would normally be expected.’
That definition is well and good for a lot of things, but it doesn’t quite fit what we’re talking about. Sure, it’s a good measure by which to judge if an action is epic, but we’re looking more for a definition that describes how a person could be defined as epic.