What is the meaning of the word "fuck up"?

Definitions:

  1. a person who makes a mess of things copy to clipboard noun
    • You are such a fuck up! copy to clipboard
  2. a person who makes a mess of things copy to clipboard noun
    • You are such a fuck up! copy to clipboard
  3. to make a mess of, destroy or ruin copy to clipboard verb
    • Be careful to not fuck it up. copy to clipboard