In a large Bowl, combine cake mix and pudding mix, sift around with a fork to get clumps out of mixes.
Add Mt. Dew, Oil, and Eggs.
Beat with an electric mixer at medium speed until smooth.
Pour batter into prepared cake pan and bake for 50 minutes.
After baking, check with a wooden pick to make sure cake is thoroughly baked.
Remove from pan and let cool completely.
While cake is cooling, mix your icing by gradually added two spoon fulls of icing to a bowl, and squirting a few drops of flavoring, stir well with fork. Repeat until full tub of icing has been mixed (Usually three times).
Once cake is completely cooled, add your icing by spreading a section at a time, then dabbing with a knife, to create a textured finish.