3/4 cup milk
1 (3.4 ounce) package instant vanilla pudding mix
1/4 cup vodka
1/2 cup coffee-flavored liqueur (such as Kahlua®)
1 (8 ounce) container frozen whipped topping (such as Cool Whip®), thawed
Beat milk and pudding mix together in a bowl using an electric mixer until pudding is thickened. Stir vodka and coffee-flavored liqueur into pudding; fold in whipped topping. Pipe or spoon pudding mixture into shot glasses. Freeze until ready to serve.