A beer milkshake is a unique type of alcoholic beverage drink invented by Dave Lister which combines his favorite drink, Leopard Lager, with a milkshake drink. In basics, it is a milkshake that tastes like beer, but it is never revealed how (it is probably just a milkshake with beer poured on it). It is not known whether or not it is a truly alcoholic beverage. Lister has taught at least one of the Red Dwarf vending machines how to create it. (RD: Waiting For God)