According to WiseGeek:
Dump cake may not have the most flattering name but it is a dessert that many people rave about. The name cake is a little bit deceptive and some people prefer to call dump cake a version of cobbler instead. When people are not praising its delicious taste, they’re often celebrating how quick and easy this dessert is to make.
Dump cake is usually a combination of canned fruit, with cherries and pineapples being some of the most preferred. Fruit is usually drained and combined on the bottom of a baking dish. Next, people add yellow or white cake mix, simply pouring the mix right over the fruit. Recipes vary but most then direct people to add slices of butter on top of the cake mix. When the cake is baked it has a lovely top crust that is buttery over a layer of sweet fruit.
at 1:43 PM on Sep. 9, 2010