1 (18 1/2-oz) pkg Butter cake mix
1/2 cup butter, softened
2/3 cup water
2 cups sugar
1 cup milk
1 (8-oz) ctr Cool Whip
1 (6-oz) pkg sweetened, shredded coconut
Beat the cake mix, butter, water and eggs with an electric mixer on medium speed for 2 minutes. Spread in a greased and floured 9 x 13" pan. Bake 350 degrees for 30-40 minutes, or until toothpick inserted in the center comes out clean.
About 10 minutes before cake is done, combine the sugar and milk in a saucepan and bring to a boil. Boil gently for 1-2 minutes. remove cake from oven and immediately poke holes into the cake, all over, with a fork. Pour hot milk mixture over hot cake and cool to room temperature, about 1 hour.
Spread cool whip over cake and sprinkle with coconut. Keep refrigerated until ready to serve. Store in the refrigerator.