let them eat cake

Let them eat cake is an idiom referring to a joking disclaimer of responsibility for a group of people. When someone tells someone let them eat cake, they are mocking a group of people who need to take responsibility for their own actions and is usually said in relation to this group messing something up or making some sort of error which in turn they now have the pay the consequences for. It is usually spoken in a mocking tone b someone outside of the group.