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1.
A sport in which two or four players hit a lightweight, hollow ball back and forth to each other with paddles. The game takes place on a hard table divided by a net. Players must allow a ball played towards them only one bounce on their side of the table and must return it so that it bounces on the opposite side. Points are scored when a player fails to return the ball within the rules. Play is fast and demands quick reactions. A skilled player can impart several varieties of spin to the ball, altering its trajectory and limiting an opponent's options to great advantage.

Many people in the United States refer to table tennis as Ping Pong.
Jeffery: Hey, what's that Olympic sport in which players use paddles to hit a small ball over a net on a divided table?

Greg: Oh, you mean Table Tennis! Or Ping Pong if you prefer.
by Amaranthian August 01, 2008
 
2.
A euphemism for sexual intercourse. Generally refers to gay sex, but is occasionally used to refer to heterosexual sex as well.
Oh, John? Yeah, I've played table tennis with him a few times, if you know what I mean.
by Fern, Defender of Trees June 11, 2009