Although quite a difficult and messy manuvure, the Hawiian Hydroplane involves a girl laying a diarreha onto a slip'n'slide, making sure to cover the whole slide, then proceeding to sit nude spread eagle on the end of the slide. Then the man, also nude, sprints a short distance and slides down the 'reha laiden slip'n'slide on his knees with an erection, positioning himself in a way to where his penis can enter the girls snatch upon collision at the end of the slide.
occurs when water builds up in front of your tires faster than your car's weight can push it away. That's when the water gets between your tires and the road so that your car feels like it's gliding and possibly OUT-OF-CONTROL.
you are just going along on a wet road and your car is like "OH I DONT THINK I WANT TO BE ABLE TO STEER ANYMORE" and you lose control of the car. you think to yourself "FUCK HYDROPLANING"