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When you drop a big load and it doesn't sink - a big part of it is out of the water like a whale (about a quarter), making it look like a whale.
It doesn't touch the sides of the toilet - just sits there.
I dropped two poop whales yesterday.
by Pope Pup August 03, 2009
A cup of win beyond succession.
Your uncles a poopwhale. IN THE BUTT!
by ChoopaCawbrah September 10, 2008