frost·ing [frostingfrostings] BrE [ˈfrɒstɪŋ] NAmE [ˈfrɔːstɪŋ] noun uncountable 1. (NAmE) = ↑icing 2. uncountable (BrE)the crime of stealing a vehicle that has been left with the engine running in cold weather so that the engine warms up •Police issued the annual winter warning against frosting car crime. •A growing number of drivers have become victims of frosting.