Top Definition
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.
Dude, it was so hot outside yesterday and me and my girl were really horny so we decided to kill two birds with one stone with the Hawiian Hydroplane.
by mpeagle February 04, 2009

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