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1.
The sphincter muscles controlling closure of the anus, responsible for smooth operation of the final step in the digestive process, defecation. Poosaw is the compound word of poo and saw, literally referring to the cutting operation the poosaw performs on excrement.
I couldn't crap for a week. My doc blamed it on my overactive poosaw.
by Ham T. Sandwich March 05, 2009
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