What does poker face mean?

A face on a person that shows no emotion, often called poker face because in the game of poker it would be foolish to show any emotional

Poker face is a Poker term it means not revealing anything about the cards. It's also used outside of poker.

poker face means a poker term for a blank expression that does not reveal anything

It means how many faces you have. I you want to win you need more

1. An impassive expression that hides one's true feelings.2. A person with such an expression.