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Copypasta as I understand it has a very specific meaning which is covered in Know Your Meme, which is different from what Wiktionary and Urban Dict have to say. I don't think there's really an antonym for it - if there were, it would basically refer to everything else that isn't copypasta. Like any of the comments on this question, or your question, etc... I suspect you're really asking about "text that is created to be reused" - which isn't quite the same thing as copypasta. (Copypasta isn't necessarily made for reuse - it becomes it afterward.)
Also, I don't know about you, but on a site like English Language & Usage I'd expect reviewers to know what an answer to a question is. This is very obviously an answer, not a critique or a request for clarification. Whether it's a serious answer or a flippant one is probably a separate matter entirely.
@DCShannon: Not as a word (neither is "eye candy" a single word), but it might be a reference to tvtropes.org/pmwiki/pmwiki.php/Main/EyeScream, although I note that the trope refers to something completely different from what the question is asking.
Have you by any chance observed this usage on SO? I know I have... and I can't help but notice that the only people who use it in this manner all seem to hail from the same (ha) region. Could it be a dialectal quirk?
I think the "even" in "What even is that thing?" serves no other purpose than as a generic intensifier, much like "the heck", but having said that, it's still quite unusual.
"Though there is a mathematical and astronomical explanation for the reason that an anniversary can fall on the same day of the week. [...]" This is probably one of the reasons why I find it so intriguing. Coining words does sound like a nice hobby to get into every decade or two though. It's also nice to know that I'm not the only one in the world who's thought about this, even if understandably few others do.
