Someone who reveals nothing about his or her emotions through facial expressions. If you are playing poker and have a good hand, or if you have a bad hand, you can't let the others know. You have to maintain a poker face so you can still win even with a bad hand, or win more if you have a good hand.
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Grammar GeekAre you thinking about the Lady Gaga song, or just the use of the work in general?How knowlegeable you are about music! It has been so long since I was up to date that I had to be told who ABBA was when "Mama Mia" came out. (I just happened to be in Sweden at the time.)
Grammar GeekAcquire two adolescent daughters and you'll get more knowledgeable.I'll pass, thank you very much.