A sweet, hoppy, strong beer brewed for real beer lovers. Barley "wine" simply refers to the high alcohol content, although Philistines often assume barley wine is wine and not beer. Apparently, these people think barley is a kind of grape. Often prefixed with the word "old".
Two guys share a special barley wine moment together:
Guy 1: How's your Old Numbskull?
Guy 2: You have to be more specific.