The term "poker faced" is generally used to describe someone who maintains a serious or emotionless expression, especially during times of stress or tension. Antonyms for this phrase could include terms such as "expressive," "animated," or "outgoing," which all refer to individuals who are more likely to convey their emotions and reactions through their facial expressions or body language. Other potential antonyms could include "open," "honest," or "transparent," which all suggest someone who is willing to share their thoughts and feelings with those around them. Ultimately, the opposite of being "poker faced" would be to demonstrate vulnerability, openness, and a willingness to communicate with others.