I think what he is referring to is more like a wiggly butt. if your rear tires are hopping over bumps through corners I would advise not hitting such large bumps...
This feeling can be exaggerated if you lift of the gas or brake hard while cornering. Also known as lift induced over steer.
2003 Ford Focus ZX3("FUBARCUS" was "Brokus") - old and still busted
2007 Subaru Impreza 2.5i - current DD