This is how we roll in P-town. This motion began as an addition to the verbal call of "shotgun". It involves making an afro with your arms over your head (signifying Bev), while rubbing your hairy forearms (signifying Bill). The motion follows
the standard shotgun rules, and must be called outside and when leaving towards the vehicle.
Eventually the motion became so synonymous with the call, the verbal portion of "shotgun" was dropped altogether.