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1.
1. An epidemic of Epic.

2. The rapid spread of an action, reaction, phrase, or general state of being which is Epic in nature.
John "Nerdfighters are so awesome!"

Hank "Nerdfighting is an epicdemic! HOO HAA! NERDFIGHERS!"
by NerdfighterSquared February 10, 2009
 
2.
Like a Disease, only, it's EPIC.
Dude, that's so contaigious! It's an Epic-demic!
by JoMaCa January 09, 2011