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1.pumping raw sewage into or out of a container.

2.takes place during anal copulation when the fuck whos fucking the butt begins the production of anal excrement

"Little Sally was grossed out because she caught a whiff of my shit when I was sludge-pumping her"
by PrimeTimeR November 26, 2005

Words related to sludge-pumping

buttfucker dirty sanchez frumkin pump sludge