While Palsy is a medical condition leading to unintended movement, Ping Pong Palsy is the embarrassing act of trying to pick up a a ping pong ball and being unable to do so. Causes you to look stupid and usually means your opponent scored. Symptoms worsen with alcohol consumption.
Seth: "Man, Dan is slaughtering James in ping pong."
Andy: "Yeah, and he's been chasing that ball around the floor for an hour. What's wrong with him?"