Bah. That starts with a silly misreading of "ping pong" and then goes downhill.

In XP, "Ping Pong" is simply "I'll write the test case, then you write the code to make it pass. Then you write the next test case and pass the keyboard back for me to write code to make it pass." It's a way to keep a pair fully engaged, particularly when working through some of the more boring parts of development. Well, in that case it helps keep whoever has the keyboard from going crazy at the prospect of, say, driving across Nebraska on I-80 without a working radio.