a rag used by teenage or preteen kids used for a bedsheet. it consists of a high fiber durable clothe that can hold up to 2 liters of piss. often used after kid has been hit prolongdly for peeing the bed. after mothers and fathers have put up with it long enough.
"Cesar! Pick up this damn pee rag its starting to stink up this fucking room!"
"Little billy keeps peeing the bed Bill. we need to get him a pee rag."