When you get a girl to half squat and fist her ass, but as you are fisting her you use the suction that your fist pumps create to loosen her bowels onto the floor. Or, if performing the "Korean Slugepump", you get her to release them onto your stomach and genitals.
'I have a hefty doctor bill to pay for the rediculous Sludgepump that i preformed on a transexual stripper last night.'
'Boy tom, is it ever hard to wash feces out of your ballhair after you admister a real good Korean Sludgepump.'
Sludgepuss (noun): a female with a less than reputable character that sleeps with any male that expresses a desire to fornicate with her and gets a foul odor in her vagina from the amount of semen she has not washed out of her causing a sludge-like consistency in her vaginal orfice.
Damn dude, I slept with Ashley last night but the smell of sludgepuss was so pungent I had to hold my nose.