Ping-pong dream meaning is explained below using 3 different sources. Each interpretation is shown with its source.

Interpretation 1 — Stearn Robinson - Tom Corbett

A game of Ping- Pong in a dream, if reasonably evenly matched, is a sign of fairly easy attainment of your current aims, but if the contest was definitely one-sided, you will have to contend with some strong rivalry before you get what you want; and this applies whether you participated in the game or only watched it
Source: The Complete Guide to Interpreting Your Dreams Author: Stearn Robinson - Tom Corbett

Interpretation 2 — myjellybean

A game of Ping-Pong in a dream, if evenly matched, predicts that you will easily achieve your current goals. But if the contest was definitely one-sided, you will have to contend with some strong rivalry before you get what you want. These meanings apply whether you participated in the game or only watched it.
Source: My Dream Interpretation Author: myjellybean

Interpretation 3 — Ella Freeman Sharpe

See Sports.
Source: Psycho Dream Interpretation Author: Ella Freeman Sharpe