Defining "Oof"

What does the word Oof mean? Well, it honestly doesn't mean anything, nor is it a proper word. But most people would define it as an expression used to show shock, disappointment, sadness, and care. How much depends on how you write it.

It is also used when you really don't have anything to say and just need to say something to show that you at least care enough to say something.

Also it's just oof