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(n.) A weapon created when an inmate models up a block of feces either from one sitting, or over many days and eventually carved into a stabbing weapon.

Once used the doodie shank will break off inside of the victim and generate a massive infection from the bacteria in the feces usually resulting in death.
Jerome died from a doodie shank infection while he was in the joint
by Death-Row Lifer August 17, 2010