To consume all three litres of a bottle of Barnstormer in one sitting. Often done in a public place by underage teens, who have purchased said beverage with a fake ID from the cornershop. Originating from Crowborough, East-Sussex where teenagers would consume the beverage at the open all hours, inside ATM of Lloyds.
Teen 1: 'Theres nothing to do around here'
Teen2: 'Why don't we go do a Barno in Morries undergroundcarpark?'
