The word sees frequent use in climbing circles. Epic usually means a climb where a lot of things went wrong or someone danced where angels fear to tread.

The word means deeds or stories about deeds done on an impressive, or imposing scale with a strong implication of heroism. Alternately, it can also mean deeds extending beyond the usual in size or scope (Merriam-Webster).

I am totally in agreement with Zen. The word is over used. However, it's a word with a lot of punch which means it's like crack for people who write advertising copy. However, if we do come up with something else, they'll just over use that word too.