"Cheesecake" - (the two-legged kind) "Caked with" - (dirt, grease, mud, etc.) "Caked on" - (makeup) "A piece of cake" - (informal - something easily achieved). "Cake walk" - (informal - an absurdly or surprisingly easy task). "Cake of soap" - It was quite common in the 'olden days'. Soap (both hand and laundry soap) came in large cakes and you would cut off a piece as you needed it.