[Pokergod]

I've always heard to "outplay" someone is to make them lay down a hand that would otherwise beat you at the showdown. This is a very impractical concept in the smaller limit games in which two or three players see every showdown. In the bigger games, where players are very much aware of the value of saving a bet, it is possible to make them lay down a winner. Hence, you have "outplayed" them.

-PG