poker face: Meaning and Definition of

pok'er face"

Pronunciation: [key]
  1. an expressionless face: He can tell a funny story with a poker face.
  2. a person who has or deliberately assumes a poker face: It is impossible to tell what that poker face is really thinking.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.