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When one takes a poo so large that the tip of the poo pokes out of the water's surface, creating a dump island.
Dude: Bro, I just took a huge dump!

Bro: Did it poke out of the water?

Dude: Yeah man, it was definitely a dump island!

Bro: Sweet.
by nastypoops123 December 21, 2011
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