This is a sex move that is performed by going from either of a woman's holes (south of the belly button) to the other, without giving her a signal that the change in lanes is coming. This is hilarious when moving to the fart-box, and a health risk when moving from it.
John Mayer: What's up, did you hear that Jennifer Aniston and I broke up?
Brad Pitt: Yeah. Did you hear that I pulled an asian lane change on her before you broke up?