When a male takes the sock from a golf club, the driver, and put it down your pants while you drive your car so it appears that you have an enlarged penis.
Random Girl: Wow! That Guy has a HUGE dick!
Random Guy: Nope, just a big driver.
OR
Driver: I feel like more of a man with my driving sock because I look like more of a man.
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The sock a male masterbates into while driving rather than use a fist full of facial tissue.
Andy; " dude why is there only one sock in your glove compartment?" Bob replies; "Don't touch that, it's my driving sock, gotta save the turtles man."