1
general::
Phrase(s): flip someone off [and] flip someone out; flip someone the bird
Sl. to give someone the finger, that is raise the middle finger, a rude sign. (The digitus impudicus.) • The youth flipped the police officer off. Not a good idea. • He flipped off the cop. • You better not flip a cop out! • The little kid flipped the cop the bird and didn’t even know what it meant.
McGrawhill's American Idioms And Phrasal Verbs