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Similar to a Thermocline which occurs in the ocean. The rapid rise or sudden change in the water temperture in the family pool from some bastard taking a piss inside it.
Little Johnnie was swimming and decided it would be funny to have Daddy swim through the urinecline.

That drunk fucking asshole, Roger took a leak in the pool and created a beer urinecline.
by Gut Digger May 07, 2006
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