Everyone has own version of a poker face, but there is one expression that can be a dead giveaway that you're hiding something. Body language expert
Janine Driver says, "Sucking in your lips until they're hidden in your mouth says you're holding something back." Two infamous examples: former congressman
Anthony Weiner, when he said his Twitter account had been hacked; and baseball player
Alex Rodriguez, when he talked about using banned substances. "I see many people do it when they're trying to hide an emotion too uncomfortable to share," says Driver.
