noun: The facial contraction that a person has when they are trying to squeeze out a turd.

verb: The act of contracting your face and gritting your teeth while you are squeezing out a turd.
My friend commented that my dump clench seemed rather intense and that perhaps I should eat some more fiber.

My friend walked in on me while I was pooping and saw me dump clenching.
by MasterChiefsBalls February 07, 2011

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