When you're boss tells you that you are fired at their retirement party. It of course holds no ground because they no longer have any authority over you. It is usually a power trip done to try to convince themself that they are not getting old and that they can still boss people around (not including grandchildren).
"Hey Jim, I heard that Janice fired you last night at her retirement party."
"No, she retire-fired me. She's just trying to convince herself that she is still in charge."