One thing I have come to realize with my 9-year-old son is that when he uses really strong phrases that if an adult were to say it it would mean something entirely different than what he, as a child means. I have found it is best to ask him to explain what he means by what he said. Almost always it is something different than what I thought. Make sure you ask him what he means. And of course call the doctor if anything seems scary after understanding what he means!