Slang aficionado …

… Odd Job Man and Language! by Jonathon Green – review | Culture | The Guardian. (Hat tip, Dave Lull.)

But what is it, exactly, that Green is doing? Slang is a pretty fugitive category. The word itself (first print appearance: 1756) is of unknown etymology and remains resistant to definition. Slang isn't a language (it doesn't have a grammar) but a set of vocabulary items, and it lives in a territory adjoining and overlapping but not coterminous with (among other things) colloquialism, dialect, euphemism, abbreviation, professional jargon and various forms of figurative speech. For his purposes, "slang" is anything Green says is slang.