A sweet glaze made of sugar, butter, water, and egg whites or milk, often flavored and cooked and used to cover or decorate baked goods, such as cakes or cookies. See Regional Note at frosting. Sports A minor violation of the rules in ice hockey in which a player ices the puck, and the puck is not played by the goalie and does not go in the goal. Icing is not called when the team that has iced the puck is killing a penalty. icing on the cake An additional benefit to something already good.