The Collaborative International Dictionary of English v.0.48:

Ping-pong \Ping"-pong`\, v. i.
   1. To play ping-pong.
      [Webster 1913 Suppl.]

   2. to bounce back and forth, in the manner of a ping-pong
      ball.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

ping-pong \ping"-pong`\, n. [Imitative.]
   1. An indoor modification of lawn tennis played with small
      bats, or battledores, and a very light, hollow, celluloid
      ball, on a large table divided across the middle by a net.
      Also called table tennis. [[originally a trade name]
      [Webster 1913 Suppl. +PJC]

   2. A size of photograph a little larger than a postage stamp.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Ping-Pong
    n 1: a game (trademark Ping-Pong) resembling tennis but played
         on a table with paddles and a light hollow ball [syn:
         table tennis, Ping-Pong]

The Free On-line Dictionary of Computing (30 December 2018):

ping-pong

    A phenomenon which can occur in a
   multi-processor system with private caches where two
   processors are alternately caching a shared location.  Each
   time one writes to it, it invalidates the other's copy.

   (1995-12-29)