ditch diving

The girl equivalent to a male receiving road head. When the male goes down on the woman while driving which causes the woman to lose control of the vehicle and swerve into a ditch.

Girl 1: Oh my God you'll never guess what we did while driving on the interstate the other day..

Girl 2: What?

Girl 1: While I was driving he went ditch diving on me, and caused me to crash the car.