A crap so big that part of it sticks out of the water thus forming it's own island.
The day after Thanksgiving I crapped so big it created a Brownberg in my toilet.

The toilet paper ran aground on a Brownberg creating a Shanchor ( shit-anchor ).
by Dr Jagz April 6, 2010
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When the poop in the toilet is stacked up and peaks above the water level.
I left a brownberg in the toilet large enough to tear the hull of the Titanic.
by THEWox March 20, 2014
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