An instance of figuratively bouncing something or someone back and forth.
Table tennis.
The exchange of proposed amendments between the two Houses of Parliament, particularly at the end of a session when compromises have to be made to complete the legislative process within the limited time available.
A small, shallow steelpan drum.
To play the game of ping pong.
To refer (a patient) unnecessarily to a number of clinics or practitioners as a form of fraud.
To figuratively bounce or be bounced back and forth.