Having rediculous, over the top, fake, porn-star type sex with the girl on top flapping about looking like a dumb ass dolphin. Most commonly observed in water (i.e. a pool) with the male sex partner in the seated postion. See the horribly bad movie Showgirls featuring Elizabeth Berkley.
Person A: Dude, why are they dolphin f*cking in the jacuzzi?
Person B: I don't know but I'm never getting in there again!
by avis2783 May 07, 2012

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