1 white cake mix baked accodring to package instruction, cooled.
(I like this best in rounds

)
Frosting:
16 oz of sour cream
2 cups sugar
12 oz of shreaded coconut
1 9 oz tub cool whip
Beat the sour cream and sugar together, fold in cool whip. Last add cocount, saving 1/3 cup for topping.
Spread on cooled cake. Put cake in fridge until you are ready to serve. Served chilled. It will keep for 3 or 4 days. The longer in the refridge the better it is.