There is a medical distinction. We've all heard about people having guts or balls, but do you really know the difference between them? In an effort to keep you informed, the definitions are listed below: GUTS - Is arriving home late after a night out with the boys, being met by your wife with a broom, 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 boys, smelling of perfume and beer, lipstick on your collar, slapping your wife on the ass and having the balls to say: ''You're next, fatty.'' I hope this clears up any confusion on the definitions.