Frost a Glass
In the cocktail world, there are actually two ways to frost a glass:
1. For "Frosted Drinks": serving glasses are stored in the refrigerator or buried in shaved ice enough time to give glass a white, frosted ice cold look and feel.
2. For "Sugar Frosted": serving glasses are moistened on the rim with a slice of lemon or lime or dipped into the juices as well as in syrups according to the recipe instructions and then rim is dipped finally into powdered salt or sugar or any other powdery ingredient such as ground hazelnuts, etc. See more in "Rim a Glass"
A typical example of this type of frosting are the serving glasses for "Margaritas" cocktail, which is rubbed the rim with lime, invert glass and dip in coarse salt.