White Dolphin 

When a person pulls down their swim trunks and attempts to crest the water like a dolphin breaching the surface, thus exposing their pale, white asses to the world. A variant on mooning in a swimming context.

"Whoa dude! Look at those white dolphins! They're going to get sunburn."

White Dolphin by Croooooooow! April 15, 2014

White dolphin 

When a guy gets a blowjob in the hot tub underwater after taking a hit off the crackpipe.

Chaz was the benefactor of a white dolphin the other night.

White dolphin by lethalvilledotnet March 30, 2009

white dolphin 

MDMA, or Ecstacy.

some of the best pills around, especially if found in southern california

little jack found a white dolphin pill and ate it, he was soon enough having the best time of his life.

white dolphin by southerncalman April 28, 2008

white-finned dolphin 

An aquatic maneuver in which, whilst swimming under water, the swimmer pulls down their bathing suit and then surfaces only their bare ass (like a dolphin surfacing its dorsal fin) to unsuspecting fellow swimmers and beach-goers. The white-finned dolphin is ideally executed by one with the palest of asses.

"I pulled a white-finned dolphin at the beach today."

white-finned dolphin by biffrichards July 6, 2006