To tie belts to both front doors of a car. Then while speeding, climbing out through the passenger window, grabbing the belts and laying on the hood at high speeds. As seen in the movie Grindhouse.
by Saint921 April 10, 2007
As the previous commenter said, to ‘play ship’s mast’ is to climb out of the passenger seat of a car with the belts out of both windows and to lie on the bonnet/hood holding the belts while travelling at speed. The film in question is called Deathproof however, not Grindhouse.
by overlordnat December 4, 2022