Welcome to English in a Minute. Do you find American idioms hard to understand? It's our goal to make learning them a piece of cake. Everyone in America knows this idiom because it's so easy.
Hey, how did you do? I'm not exam. My bad and egg. The exam is a specific cake.
In American English, when you say something is a piece of cake, it means it is very easy to do. In the 19th and early 20th centuries, African Americans started cake walks. They walked or danced around a cake in pairs and the best couple won the cake.