That is one of the dumbest things I have ever heard Eejit. The definition of a concept is that it IS describable. A thing that is indescribable is not a thing. If you can't put a name, a quality, any attribute to it, then you have nothing at all. If there is absolutely no knowledge at all about it, then you have succeeded in saying nothing.
How is it that you debate the application of logic, when you don't even know what it is? If you understood what logic is, there is no possible way you could believe that it is for some reason limited to the "real world". You have some false concept of logic in your head that revolves around physical laws and the way the world works.
The definition of anything uses logic. If you think of an imaginary being and call it God, you are using logic. Without logic, you can't define anything. An object could simultaneously exist and not exist. If that were the case, then that object is undefined.
Ask your math teacher or maybe your philosophy teacher to explain it to you, or look it up on Wikipedia. Don't trumpet your mouth off about what you don't understand.