Take a powder!

To leave a place very quickly and often discreetly. Sometimes used as an imperative. Realizing they would blame him for the error, Jim took a powder while everyone's attention was diverted. I recommend you take a powder before things start getting dangerous.

Scram! This tough-guy phrase came from the days when a ladies' bathroom was euphemistically called the powder room, the place where women went, among other reasons, to apply makeup. As gangster movies would have us believe, a lady's escort who wanted to discuss a matter in privacy with another gent told her to “take a powder.” Similarly, a genteel way to say you were going to the ladies' room was “I'm going to powder my nose.”