Give somebody/get the bird
Definition 1 of 2
Pro Tip 1/3Informal Insult
Used among friends as a joke or seriously to show strong disrespect or annoyance. 
When I beat him in the game, he gave me the bird out of frustration.
Pro Tip 2/3Avoid in Professional Settings
It's considered highly inappropriate in workplaces, formal occasions, and public settings. 
Remember, giving the bird during the meeting can get you into serious trouble.
Pro Tip 3/3Could Incite Anger
This gesture might provoke a strong, negative response from the receiver. 
She was calm until he gave her the bird, and then the argument escalated.