I saw this for Animal Crossing City Folk. They had hacked items...like cutting a tree down with a chess piece and hats that make your head invisible?!
First off, what does DLC stand for and is this stuff released yet or coming soon...
Here is the source: http://www.aibohack.com/wii/index.html
DLC is DownLoad Content, so you can download it from the Nintendo server, but you probably have to pay for it.
What they might have done: they faked some DLC in custom WADs.. this would indeed be possible from a theoretical viewpoint. Though I doubt the game even supports real DLC it just seems that you unlock stuff which is already on the disc.. otherwise if you invite someone to your city they'd have to download all crap you have there!
So that's what that means, thanks...guess they were just hacking the items on the disc or put it on a hard drive and then hacked them