Undead Threadery would best be explained by sionnsar, but I'll give it a whack...
About 15 months ago, a really dumb Donk (democrat) made a FABULOUSLY stupid post on FR.
http://www.freerepublic.com/focus/f-backroom/1163131/posts
This "troll" (aka: Moby, DUmmy, asshat leftist puke) was promptly set upon and torn asunder by the Doughty Warriors of the VKS (Viking Kitty Society).
At some point, the troll was ZOT!ted (exterminated, kicked off FR, account banned) by one of the Almighty Mods (be VERY afraid!). At that point, that thread officially became a "ZOT!" thread.
Now, trolls "catch the ZOT!" here on FR many times per day.
Most of the time, their threads or posts are deleted when their user accounts are nuked. However, for a variety of reasons, sometimes the Almighty Mods deign to allow us to wreak havok on the thread. Usually the fun continues for not longer than 24 hours - usually far, far less.
However, on that one particular thread, the stomping went on and on... and on... and ON...
Part of the initial longevity stems from the concurrent but unrelated thread posted by a FReeper named "al baby", in which two of the first True Freeperisms were coined: "stune" and "beeber"
So far as I know, the first iteration of Undeadness came here:
http://www.freerepublic.com/focus/f-backroom/1163131/posts?page=352#352
where Conspiracy Guy asked The Scourge of Yazid (now known as Do not dub me shapka broham... don't ask me, I don't know why he did that) "I thought this thread had died."
Darksheare added to the necromancy with #366: "Thread isn't dead uintil we who are the Nexus of Thread Killing Power congregate and annihilate the thread's hit points.
There are many of us, and we don't know who all the nexii are.."
Throw in the efforts of many of the keenest wits and funniest wags on the site, and the thread kept on growing.
I came rather late to the party, though as of right now I don't know where exactly that was or who dragged me in, dammit...
The first real indication of Undeadhood comes at Conspiracy Guy's post#859, I believe...
well, anyway, someone at some point got the wild notion of rolling the thread until it blew out the server's per-thread post limit (65,535 posts), and the Beast That Can't Be Killed was born.
The RKBA was brought into being somewhere in the low 3000's IIRC...
(Timpad? M'Lord, as Our Wizard and Finder of Lost Things, would you be a dear and find Our first post, and discover the genesis of the RKBA?
Hrmn?
Yes, yes... that's interesting, but We don't think We shall attempt it: It sounds uncomfortable and... anatomically improbable.
nevermind, then.)
Anyway, we loons have been at it ever since.
What is this thread about? Last Post?