English Wikipedia has an article on:

flip off

Wikipedia

flip off (third-person singular simple present flips off, present participle flipping off, simple past and past participle flipped off)

1. (informal, transitive) To make a rude or obscene gesture at someone.

   Would you believe he flipped me off over that comment?

   He was so pissed he flipped off the policeman.

• The specific gestures this term refers to varies by region and dialect.

• flick off
• flip the bird
• give the finger