A poker face is an inscrutable facial expression that reveals no hint of a persons thoughts or feelings. It is a deliberately-induced blank expression meant to conceal ones emotions. The term comes from the special language used in poker, and it is not only about facial expression but also other extraneous movements that could give insight into what one is feeling, such as clenching fists, bouncing a leg, or constant repositioning of ones body and/or cards. If someone has expressed that you have a poker face, it generally tends to mean that you are hard to read and they do not know what you are thinking. The term poker face was used outside the game of poker by American sportswriters in the 1920s to describe a competitor who appeared unaffected by stressful situations. It is similarly used with reference to marketers and salespeople during business negotiations. Lady Gagas song "Poker Face" is also known as a bisexual anthem.