johnny cashed means in slang: This clever twist on the well-known phrase “cached” is a smart addition. 1. Once the marijuana pipe or any other smoking device reaches a point that it is no longer useful, the pipes should be empty and reloaded. 2. It can also be used to refer to a position in the *** smoking cycle that occurs immediately after the last hit. 3. A negative term can also be used to describe a marijuana bowl that has been stored. It indicates that someone is not interested in taking a hit of resin. This term is a pun on the Johnny Cash1932-1903 name. It has nothing to do with Johnny Cash’s drug habits, it is a joke about his name. (in Slang Dictionary, added by Hillary Alexander)