give someone/something the finger
give (one) the finger
1. To raise the middle finger (a rude gesture of anger or displeasure) at one. What are you giving me the finger for, I didn't even say anything insulting! I gave my brother the finger after he said that he'd never seen a worse basketball player than me.
2. To treat one poorly or display contempt for one. Making us sit in the very back row is basically his way of giving us the finger.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
give someone/something the fingerINFORMAL
1. If you give someone or something the finger, you do something which shows your anger at them or lack of respect for them. His business would be more successful if he didn't give the finger to most of the commercial opportunities that come his way. He could afford to give the finger to people like that.
2. If you give someone the finger, you make an offensive gesture with one hand, with the middle finger pointing up and the other fingers bent over. The great thrill was to give passers-by the finger through the window.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012