The term 'British Tube' is a combination of two words, 'TELLY' and 'SUBWAY'. TELLY is a British slang term for television, which is a device used to watch shows, movies, news, and other forms of entertainment. SUBWAY is a form of public transportation in the United Kingdom, consisting of underground trains that travel between stations. Together, these two words form the term 'British Tube', which is a reference to the combination of television and public transportation in the United Kingdom.