Like the description says this is The Good Omoplata.
We have all been taught the traditional way where you sit up with the near arm and try to hug over the hips. As you can see in this video it is literally the complete opposite. This is a good thing for a number of reasons.
The first reason is you can disengage your hips from your opponent fairly easily. By moving your hips away it buts a LOT more pressure on the back of your opponents shoulder and increases domination.
This video is hosted from www.youtube.com