Death by Chocolate is a colloquial descriptive or marketing term for various desserts that feature chocolate, especially dark chocolate or cocoa, as the primary ingredient. The phrase is trademarked, and the dessert is a signature dish of Bennigan’srestaurants in the United States.

Some chocolate cakes and Devil’s food cakes are called or have the moniker “Death by Chocolate cake and some of these may be served with a chocolate sauce, such as lava cake.Ingredients used in Death by Chocolate cakes may include basic chocolate cake mix ingredients, chocolate pudding, chocolate chips, shaved or grated chocolate, whipped cream and powdered sugar.

https://www.delish.com/cooking/recipe-ideas/recipes/a54546/death-by-chocolate-cake-recipe/