The difference in definition between "guts" and "balls"
Guts-is arriving home late after a night out with the guys,being assaulted by your wife with abroom and having the guts to ask:Are you still cleaning,or are you flying somewhere?
Balls-is coming home late after a night out with the guys,smelling of perfume and beer,lipstick on your collar,slapping your wife on yhe ass and having the balls to say,"you're next fatty."