What's some British slang that really confuses tourists?

Americans and smoke because their term isn't used much round my way. Mind you I don't hang around people bragging about murder, let alone of gay men. Some book, might have been Terry Pratchett and someone else, an American air base was near by like Mildenhall. Character asks a soldier for a fag. What you gonna do with em? Smoke em of course. Nice. Not sure what decade or the exact line as I was told about it rather than read it myself. IIR faggots in the oven too. If the Internet didn't exist, no one would really associate them with slurs outside of the LGBT community and even then I'm not sure if either were in use back in my youth. Eg watched a 70s film and asked my dad why he called that man a cigarette. I don't think my age had anything to do with it, because by the time I was 18 that film was probably my first of two encounters with the term in the near decade between. Many racial slurs were only heard in 70s films, not on the streets of the UK.