specifically, 'john' is american slang for a toilet; the corresponding british slang is 'loo'. 'ringo' is an example of a very well known englishman, so 'to rin

specifically, 'john' is american slang for a toilet; the corresponding british slang is 'loo'. 'ringo' is an example of a very well known englishman, so 'to ringo' is an acceptable indicator to clue 'to an englishman'.