flip someone off

flip off

1. To turn something off, typically a switch. A noun or pronoun can be used between "flip" and "off." I flipped off the living room light and headed upstairs to bed.
2. To raise the middle finger (a rude gesture of anger or displeasure) at one. A noun or pronoun can be used between "flip" and "off." What are you flipping me off for, I didn't even say anything insulting! I flipped my brother off after he said that he'd never seen a worse basketball player than me.
See also: flip, off
Farlex Dictionary of Idioms.

flip someone off

and flip someone out
tv. to give someone the finger. (Collegiate.) Did you flip me off? You better not have. Ernie flipped Tom out, and Tom flattened Ernie. Ah, life in the big city.
See also: flip, off, someone
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • base off (of) (something else)
  • check off
  • bite off
  • blow off
  • blow someone/something off
  • blow off the map
  • brass off
  • brass someone off
  • brassed off
  • call off
References in periodicals archive
When you e-mail someone The Bird you can flip someone off openly and tell them why, or you can send your bird anonymously.
Asked why he thought people might like to flip someone off by e-mail, Josh said, "Three reasons: One, it's funny; two, it's easy; and three, nobody has offered a service like this on the Internet.
A WAY TO FLIP SOMEONE OFF VIA E-MAIL USING NEW WEBSITE
But you should at least have the ability to flip someone off who almost causes an accident."
Road rage shouting begins; Police, drivers seek guidelines