Ahhhh yes. That phrase that every non-thespian wonders about. It's what actors say to each other to wish each other luck. Why do we say it? I really don't know. But we do.
Some theories. My personal favorite is that we're just being backwards and we're wishing "bad" luck to be backwards when we really mean "good" luck.
Another popular theory I've heard is that it refers to taking a bow, when one "breaks the line" of the leg. So in that sense it does mean good luck, because we want each other to have a successful reception from the crowd.
So there you go.
