As a midwife we refer to a "bloody show" as an indicator someone is nearing or fully dialted. Some people want to be tricky and will have this much earlier then this during there labour so its not always accurate indicator to the progress of labour but most times it is. We have people calling to ask and say they have a bloody show which is the mucous plug so they can also be described as the plug. I guess its the way you say it as to what meaning you have. I may say "have you had a show" or "have you lost your plus" and I mean exactly the same thing.