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.
Your driving finger is the longest finger.
by andrew macnamee November 06, 2007
As opposed to the previous entry, this involves actually using a single finger to control the wheel, while you have the cell phone in the palm of your hand, and the other hand is either texting or dialing-- or seaching for the next song to play on the Ipod.
Johnny was using his driving finger to slip through traffic effortlessly, as he texted love notes constantly to his slut du jour.
by politicalsanity August 14, 2008