What is the defining characteristic of the Mudslide cocktail?

The defining characteristic of the Mudslide cocktail is that it includes ice cream. This ingredient contributes to the cocktail's rich and creamy texture, making it a dessert-like drink that is both indulgent and flavorful. The combination of ice cream with other typical ingredients such as vodka, Irish cream liqueur, and coffee liqueur creates a unique blend of sweetness and depth, setting the Mudslide apart from other cocktails.

While some cocktails may be served in specific types of glasses or utilize certain techniques like blending, these features do not define a Mudslide. The inclusion of ice cream is what truly characterizes this drink and defines its distinction from others.