joint rag
n.— «Magazines produced by prisoners are called “joint rags.”» —“A convict’s look at life on the inside” in Carleton University Carleton Newsroom (Ottawa, Ontario, Canada) July 21, 2009. (source: Double-Tongued Dictionary)
Further reading
She sells seashells by the seashore. Who is the she in this tongue twister? Some claim it’s the young Mary Anning, who went on to become a famous 19th-century British paleontologist. Dubious perhaps, but the story of her rise from seaside...
Mary Lou is a former newspaper reporter in Memphis, Tennessee. One of her editors used to say he was off to the salt mines, meaning he was headed to do some challenging work. That expression is a reference to the grim practice of sending prisoners...