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
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A man positions himself quite precariously on a womans face so that her nose just barley slips into his butthole and so that his nuts may, if he so chooses, slowly sink into her mouth giving her a tea bag. Then women proceeds to "jerk the man off", the man then proceeds to take a dirty black colored shit all over her face. This black color can be acheived from intaking excessive amounts of vodka. It's quite the experience.
"I say darling, that dirty sludge pump you gave me earlier had such a rich color and flavor."
by Tonger10 June 23, 2009
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Also known as the kamikaze jump, this is a jump off of a high geographic feature while holding in a rather large hit of marijuana.

To elaborate, it is a name for the process of taking a large hit of smoke, and holding it in your lungs untill after you have gotten in the water and surfaced after you have jumped.
Hey guys, lets head down to the quarries and kamikaze that shit with a sludge-pump-jump

Anyone got bud? I wana sludge pump jump into the river

Holy potatoes man! that was a diesel sludge-pump-jump

Im a sluge-pumpin superstar
by Chizzy McGrizz June 18, 2011
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