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1.
A blogging term meaning to write, in response to a blog post, a comment that ends up virtually unread at the end of the comment thread as another post goes up and all commenters proceed to leave responses in the new thread. Term derived from a habitually late commenter who posts as "Evil Parallel Universe" at the political blog firedoglake.com.

Note to the editors: I am in no way affiliated with firedoglake.com, and include this blog's name only because it is where the term originated.
"This got EPU'd, but I'm posting it again because I think you guys really need to read this."
by Hell Upside Down May 25, 2006