Well, I can't explain because here's the thing...
1) In the interest of surpassing my limitations, I concocted a 2,678-word post with an explanation of where it came from, an argument for why I shouldn't have it, an argument for why I should have it, an argument for why maybe it doesn't matter either way, and examples of possible other tags that may have worked more effectively while still being demeaning and tongue-in-cheek in that most strictly unique-to-GAF sense. But...
1b) I realized that if I ever posted said explanation (+ accompanying thoughts), it would derail a thread. Now, if the thread were one that I liked, such as this VC thread or the Chrono Trigger DS thread (another place that I've been asked), then I wouldn't want to derail and thus I couldn't post. If it were a thread that I didn't like, then I wouldn't have been posting in it to begin with, and hence people wouldn't be seeing the tag, and hence people wouldn't be asking about it, and hence I wouldn't have been inclined to post my explanation. So it seems that there would be no opportunity to directly explain through the usual forum posting methods without stirring up some form of trouble. (Or shortening my explanation, but I feel that more is better when it comes to posting and, besides that, it would be painfully out-of-character for me to be concise. Which is why one of my made-up tags would be "plz ignore my walls of text," although admittedly that could fit equally well for a number of other people such as A Black Falcon. Sorry there, ABF, but it's the truth! <_<) Therefore...
2) I came up with what I believed to be a genius plan of dumping the post into Word, taking screen captures, and linking people to those screen captures. This would allow for the full explanation to come through while only occupying a few lines and preventing people from derailing a given thread by quoting the post directly. However...
2b) I realized that if I had saved my post as images and was linking people to them, then there would be nothing stopping people from displaying the images directly and derailing a thread that way. (Insert all my thoughts on derailing here; same argument as before.) Therefore...
3) In the interest of preserving some modicum of sanity on GAF, I would create an Off-Topic thread asking people to explain the story of how they got their tag and what they think of it. This would be especially timely given Denis Dyack's seeming fear that people are potentially scarred by tags, since such a thread could make for a time and place wherein (and when-in?) GAFers provide evidence to demonstrate otherwise. Except...
3b) I realized that if I posted such a thread, it would look like I was in some sort of sour grapes mood, which I'm really not despite the lack of truth. (If anything, it would be
because of the lack of truth.

I won't get people quoting my tag back to me because my posts will more or less never match up to it in a way to allow for that delightful GAF pastime, and--ah, well, let me save it for the gargantuan post.) I don't want to come across as upset if I'm not. Therefore...
4) I decided that I would wait for someone else to create such a thread before providing answers.
And I think that's where I still stand, though as with the three plans before it this is subject to change should I identify some flaw (such as, for example, the possibility that such a thread may never come to exist).