This is a very, very common thing amongst Irish people when describing a person, place or thing. Because sometimes we can't articulate how large or small an object is, or the skin tone of an individual or even the heat of a local curry dish - we use this a lot! We basically just say the word twice and the person who gets the info knows exactly what we mean by tone alone.
Usually emitted from townies. A refusal to do something. Usually delivered in a strong town or Ennis accent, with lots of swagger and attitude. Beloved of town skangers.