Christmas Cupful is a festive holiday drink made with eggnog, a traditional holiday beverage. Eggnog is a creamy, custard-like drink made with milk, cream, sugar, and eggs, and often flavored with spices such as nutmeg and cinnamon. NOG is a shortened version of eggnog, and is used to refer to the drink itself or to describe something that has been made with eggnog. Christmas Cupful is a delicious combination of eggnog and other ingredients, such as brandy, rum, or whiskey, that is served in a festive cup.