Yummycakes are some type of cakes that are so yummy. These cakes, are so good you won't want to destroy the president, and are also so good you can use them to get a girlfriend.
If something is bad, then it can described as "a fate worse than tummyache". For example, being kicked in the nuts by a miss rosie, or being forced to talk to kim
Kim: Why do you want me to unblock you?
Lar: I don't. Then you could talk to me, and that would be a fate worse than tummyache!