- noun a prostitute’s customer. John was a 19th-century term for a male sweetheart which was adopted by prostitutes as an all-purpose form of address and later as a synonym for client.
- noun a toilet. Originally a more genteel American version of the archaic ‘jack’ or ‘jock’ and the almost obsolete jakes, all euphemisms for a privy.
- noun an arrest. A rare example of police and criminal jargon of the 1960s, from the rhyming slang ‘John Bull’: pull.
- noun the penis. A fairly rare but recurring usage. Other personifications, such as John Thomas, willie, peter, percy, etc., are much more common.
- noun a condom. A shortening of ‘johnnie (bag)’ or rubber johnny.