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1.
When a woman consumes large amounts of water to make her urine so clear that she can urinate on a man's face while he performs oral sex and he thinks that he got her to orgasm and squirt.
He tells all of his friends that he can make me squirt, but it's a Seattle Shower every time.
by Rhino Droppings May 15, 2011
 
2.
When you pee in a girl's butt and the girl squats over your cock and drenches you with shitty piss. The heavy downpour is said to be reminiscent of a Seattle shower over the Space Needle.
Gabriel gave Kelly a Seattle shower.
by Buttfor March 04, 2009