In a manual transmission car; when shifting from 5th gear to 6th gear and continuing to move your arm on to your passengers' leg.
(same as 5th gear slide but for cars with 6 gears)
I was driving on the freeway with Rob in my car. I had just upshifted from 5th gear to 6th gear. My hand was so close to his thigh, I just went for it in one subtle motion. I totally pulled a 6th gear slide.