Yeah, I'm still REALLY surprised people take the name so seriously. The internets' sarcasm detector must've broke, I guess.
Anyways, I discovered a new use for this. I might do a video, but considering how ungrateful everyone has been, (since none of you have brawl and are just comparing this to melee advanced techniques), I'm seriously thinking about not sharing it. (thanks to those who have actually watched the full video, and commented with legitimate criticism.)
Marth can jump forward, fair, and waveland backwards using this technique into a perfect tipper'd fsmash spacing. (Just like in Melee how you could fair, and use the airdodge to waveland, but now you can just use the momentum of DI'ing backwards to waveland. Going forward doesn't work.)
So, basically, if you've never played Brawl, and you want to come in here and whine about how useless this is, just GTFO. In Brawl you have five options for movement. Run, Walk, Stand, Fox Trot, or Jump. Now every character can use DI in the air to control a slide on the ground AFTER doing an aerial (forward or backwards), so there's one more option.
I will post the video Deva talked about, I do have some recorded uses of it in an actual match. (not the fair into waveland, but the backair'ing over projectiles he mentioned)