What is "naggin"

n. A small measure of spirits.

A naggin in Ireland is a 200 mL bottle of spirits. Major brands of vodka, whiskey, rum, and less often gin, are commonly sold in this size in off licences, especially independent (non- chain) shops at a 40% alcohol rate. Naggins are more common than half-bottles (350 mL, known as a 'shoulder or Daddy naggin'), though for the less popular majority of products neither size is available, only the 700 mL EU standard bottle size. The naggin bottle is typically the shape of a large hip flask, suitable for placing in a pocket.

According to the Oxford English Dictionary, naggin is a variant of noggin, a word of uncertain origin recorded from the seventeenth century and meaning a small quantity of alcohol, usually one gill . Tomás S. Ó Máille derives it from the Irish naigín, cnaigín, a small wooden pail with a capacity of two glasses.

Naggins, particularly of cheap vodka, are popular among youths, under-age drinkers and students. They are often implicated in binge drinking.