To raise the index finger to in order to show that you are angry, pissed, annoyed or otherwise cross with someone. It is also called "flipping someone off".
Person 1: The psychiatrist told me that I had Oppositional Defiance Disorder because I did not want to take the over-prescribed drug for being "over-active".

Person 2: Dude, are you going to let that guy give you the middle finger?! (NOTE: figurative use)
by Moises (Moses) January 14, 2012
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flip someone off, raise the middle finger in an aggressive gesture. The middle finger suggests an erect phallus.
The driver was tailgating me, flashing his lights, and beeping his horn to get me to speed up, so when he passed me on the right, I asked my daughter to give the middle finger.
by DonaldAlan November 11, 2022
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