Oh, that? That was what happened when an innocent Earth Day post went horribly, hilariously wrong. You can read the original post here.
To "get it" you'll have to take a gander at the comment section, though (and let me apologize in advance for that).
Then you can read the following day's fall-out (and subsequent hilarity) here.
At that point, you'll be all caught up, clued in, and part of the "in" crowd. Promise.
Official definition: An "Epcot" is any comment that is repeated to an absurd degree. This may be as few as four in a row or as many as 42 but no more. 43 would be considered a "Spaceship Earth." In addition, only those who have read the blog for more than a year are allowed to declare an "Epcot" and to take cover in the "Epcot Bunker." Provisions in the bunker may include popcorn, candy and, of course, cake. And 2% milk. There will be no skim milk allowed in the bunker because, really, what's the point.