Your middle finger. Usually refers to the one on the left hand so it can be displayed out the driver’s side window to comment on another driver’s behavior. Found on urbandictionary.com
I will admit that I have used my driving finger for bad. Haven’t we all? Your just driving around some idiots one day when you get off work and they just barely car swipe your car, or maybe nobody will let you get out of the commotion and your finger just kind of pop ups. I think it’s happened to the best of us.
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