To rim the glasses: place corn syrup or honey on a small plate and sprinkles in a small bowl. Dip the rim of each glass in the sticky syrup, then in the sprinkles.

If using canned frosting, heat it until it's warm and pourable but not too hot (15-25 seconds for most microwaves). If using a homemade frosting, make sure it is very room temperature and smooth. Pour into a jar or something with a tight fitting lid. Add the vodka, then seal and shake vigorously, until the frosting is mixed with the vodka.

Pour into glasses and serve. You can also let this sit for up to 3 hours, then shake and pour before serving. They'll last in the glasses at least an hour before starting to separate.