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To be so severely constipated that the clogged feces is literally capping the sphincter preventing release.
Carl: please help me Doctor. I'm so constipated.

Doctor. You need more fiber, Carl. Otherwise you will continue to get Sewer Capped like this.

Carl: Sewer Capped? Is that a medical term?
Doctor: Yes. I read it on Urban Dictionary.
by Tugg N. Harder March 29, 2014
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