In the seat(s) below the sun roof of a parked car, the female rides the cock shaft using sun roof for leverage. From the bystandard POV (point of view) her head pokes in and out of view from the sun roof creating a bobbing bobber effect.
"Honey what do you think is going on in there?" as the wifey points out a mysterious visual of a womans head poking in and out of view from the next parked car. "Ha ha sweetheart, thats a bit of the Solar Bobber, the lucky bastard!"