Looks like we're ganging up on you -- see below!
Chine walking is an effect caused by a deep V hull at speed, where the hull is lifted so far out of the water that there is very little lateral (sideways) stability.
The result is that the hull falls over to one side. As the chine makes contact with the surface of the water the force then pushes the hull back the other way, creating a dramatic and potentially dangerous motion.
Most hull designs these days feature some sort of modification to the plain deep V to help counter this -- planing pads, spray rails and variable V hulls can all help, although they are not necessarily the perfect answer.