This is the signature move of John Mak. Everytime he gives us tons of homework, he says piece of cake to make us feel worse. People who don't know what this means might get confused, for they might think John Mak is giving out cakes.
Student A: Today no homework?
John Mak: Today's homework is Chapter 1 Q10-30.
Student B, C, D, E, F, G, H: WHAT?!?
John Mak: Piece of cake.
derived from snack dad, a cake butler is a parent who dispenses sweets to their children on demand, offering no resistance. A cake butler is said to be incapable of standing up for themselves, and is synonymous with pushover or spineless.