Meaning of frosting

frost•ing

1. a sweet mixture, cooked or uncooked, for coating or filling cakes, cookies, and the like; icing.
2. a dull or lusterless finish, as on metal or glass.
3. a process of highlighting the hair by bleaching selected strands.
4. a material used for decorative work, as signs, displays, etc., made from coarse flakes of powdered glass.
5. something added to make a thing better or more desirable.