Before Mishima got around to adding avatars or picture links, all we had to work with was text and a forum. It was simple, and shitposting was slightly less prevelant than it is now. A post was made on the forums on April 24th, from a user named "Naked_Mitsuru", it seemed to be a smut roleplay thread of some kind, though the question of the entire thread being ironic or not is still up for debate. Regardless, people replied. Most were not into the post whatsoever, urging Mitsuru not to enact her plan of putting sharp objects into her vagina. Eventually, like any thread, people lost interest and moved on to other things. As a result, the thread was considered dead, even after it's large number of replies.
That was, until a few days later. Every once in a while, a jokester would find the thread in the deeper part of the forums and bump it, enticing a heap of new replies. This went on for some time, even prompting Mishima to consider killing the thread. Eventually, a group of shitposters came up with an idea: Get the post to 666 replies, and even to 1,000 if possible. The game was on, and throughout the entirety of May 3rd, people would spam and bump the thread in hopes of reaching their goal. Then, today on May 4th; the goal was reached. The 666th reply was posted by IamThou; and the thread was locked from any further replies, likely by Mishima himself.
As of now, tribute threads are being made, and similar accounts are being created in hopes of capturing the same feeling as the original post. Regardless of what happens next, if the sheer fact that a thread titled "Mmm I'm in my bed" managing to be one of, if not the most replied to threads on the site doesn't clue you in to this site's userbase, then nothing will.