Homemade Chocolate Frosting

What type of icing, the type you can pour like glace or frosting as on a birthday cake?
For the pour on type ~ Powdered sugar, Coco and a tiny bit of milk. Depending on how much you need . . . for 1 cup of P. sugar ~ add 1 tablespoon of coco and 1 to 1 1/2 Tbsp. milk, you can add 1/2 tsp. of Vanilla. It will thin more than you think be careful with the liquid. You can add more coco if you want more chocolate. No real rules on this one! : )