frosting

Short definition from Wiktionary

Noun

1. 1
   Icing, a sweet, often creamy and thick, covering for cakes and other baked goods.
2. 2
   A layer of frost.
3. 3
   The theft of a car while it is left unattended, especially when its engine is left running in the winter to defrost the car.

Verb

1. 1
   present participle and gerund of frost