That means instead of hitting a backhand shot, you're arcing the racket around the back of your head to the front with your forehand in order to hit a shot on your non racket side.
Know of any instructional videos on this? I understand the concept, I'm just a little naive as to how make this shot.
I'm not sure that there are any videos specifically in regards to around/over the head shots. I would say simply practice it, then slowly try to incorporate it into your game. It's a very useful shot. If you're looking for some good examples, just watch any matches with LD or LCW, or pretty much any good singles match. They use it quite often and if you watch their footwork and how they position the raquet, you can get a good feel of how to do it yourself.