Top Definition
The valve at the base of the brain that restricts or allows thoughts to become words. The Cerebral Sphincter is undeveloped in small children and also in idiots.
Older sister, "MOM!! Sissy just tole that lady that she was a Fatty!!" Mom, "It's ok honey, Sissy's Cerebral Sphincter isn't fully formed yet."

That guys Cerebral Sphincter must be broken, he say's anything that pops into his mind. It's like he has oral diarrhea.
by Wordmeister Brew August 18, 2011

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