Epic/epos, a genre of poetic story a good hero(es) in war against evil. Epic also means "like an epos". A epos does not have any value in itself but was confused or just fused with the word opus meaning great,long or important. Epic thus came to mean "strong" things like mythic, legendary and heroic. By some people (people saying lol?) it is used in a trivial manner.
"I just read Lord of the ring."
"I just killed hundreds of armies with bare hands! Saving our country from evil."
"I just ate FIVE hamburgers for breakfast!"