Complete disregard on the part of a friend, girlfriend or ex-girlfriend for any minor stupid thing you said or did while drunk (i.e. drunk texting, drunk calling, drunken Facebook status updates, drunken confession, ETC).
Ex-girlfriend: "We broke up two days ago. Why did you call me at 3 A.M. for a booty-call?"
You: "I plead drunken immunity."