flip someone the bird stick your middle finger up at someone as a sign of contempt or anger. informal, chiefly US
2019Sarah BaxterSunday Times In shock, he manages to walk stiffly from the wreckage. 'I'm such a fool,' he mutters, fearing the royal life of confinement has got him in the end. But not yet, dammit. As the credits roll, he flips the bird at his critics, clambers back into the driving seat of his replacement Land Rover and speeds off without a seatbelt.