Derived from the term 'Non educated delinquent'. NED was written on the bottom of school reports in the old days when the pupil hadn't achieved anything at school.
Scottish term used mainly in the west coast, similar to chav, scally etc. Often wear tracksuits (with the trousers tucked into their white socks) or some really 'pure dead' expensive label. Hang around in groups around shops or bus stops or mcdonalds. Wear far too much gold jewelry.
Drink bucky or some other drink that makes you pure 'mad fer it'. Often comparing knives.