So there are plenty of online resources of what voodoo flossing is. But basically the gist is that you tightly wrap some affected area, e.g. ankle, elbow, finger with that rubber sheeting/bands used for physio, and then you perform range of motion exercises. The goal is to hold all the tendons and muscle close together and close to the bone, and they get much greater friction from the normal stretching and range of motion exercises, which abrades away the scar tissues much better than if they were at their normal spacings.
I've just bought some of the rubber bands and trying it on my ankle which has always been a bit tight after a sprain a few years ago. It certainly felt good, for whatever that's worth.
Here's one dude extolling the virtues for his finger: http://www.hcrbeta.com/climbers-should-experiment-with-voodoo-flossing/
And here's an ankle: