I could not cut and paste this recipe for some reason, but I have had this version. It is from http://southernfood.com
1 german chocolate or other chocolate cake, baked in a 13x9x2" pan
3/4 cup fudge topping
3/4 cup caramel or butterscoth topping
3/4 cup sweetened condensed milk
6 chocolate covered toffee bars
1 tub whipped topping
Do not remove the cake from the pan! After the cake cools, poke holes in teh entire top of cake with a large fork or a handle of a wooden spoon. Pour (one at a time) fudge, butterscotch or caramel, and sweetened condensed milk over the top of the cake and let each flavor soak in before adding the next. Crush 3 of the candy bars, and sprinkle on top. Frost the cake with the whipped topping, and crush remaining 3 candy bars on top to decorate.
This is very good!
Fudge and butterscoth, or fudge and carmel, not sure if it's good to use three toppings, I suggest just two.