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]

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.]