Any of an ever-increasing variety of (usually malt liquor--a fortified wine yielding higher alcohol concentrations of 18%-20%) alcoholic beverages distributed in 40-ounce containers (usually glass). Some popular brands include
Olde English 800,
St. Ides, King Cobra, and of course, the one that "works EVERY time" according to Billy-Dee Williams, teh
Colt45.