Freudian Flip
Like a Freudian slip, but instead flipping someone off. When your hand just happens to have the middle finger up.
Person 1: "You really need to work harder..."
Person 2: * starts scratching their shoulder with middle finger up*
Person 1: "Hey! Are you giving me the Freudian flip???"
Person 2: * starts scratching their shoulder with middle finger up*
Person 1: "Hey! Are you giving me the Freudian flip???"