I heard the phrase in a film featuring a frustrated American phoning his Boss. At the end he tells his Boss to " P*** up a Rope " meaning ( presumably ) to P*** off? Is this a real American phrase or just a movie invention?
The first time I heard it was when famous anti-establishment figure Larry Flynt used it as an alternative method of passing the time, for people who don't like reading his magazines, or watching his videos. I thought it very evocative, and have used it several times since!