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Slam Dump 

The act of having a bowel movement that is so urgent and formidable that the individual grabs the toilet rim with two hands and vocalizes a sound similar to that of an NBA star who just dunked a basketball. Ie: "Ahhhhhhhhhgh"
Lebron James ain't got nothing on the two handed slam dump I just made in the teachers lounge toilet.
Slam Dump by Jimmy frank February 13, 2014

Slam dump 

The immediate release of poop as soon as you sit on the toilet after holding it in for a while or after eating too much. Just like a slam dunk, only done with the ass.

Having to take a shit real bad
I went to go eat with a friend the other day. When we go back to the dorm he scurried to the bathroom, taking small but quick steps. Seconds after he shut the door I heard him shout "slam dump!"
Slam dump by Dr_Girafales May 11, 2011

Grand Slam Dump 

A large shit that involves sweating and strainging so much that a change in wardrobe is necessary. Counting down from 10, start removing all your clothes. When all clothes are removed, release the load of shit from your anus and yell "Grand Slam". Then, if you are Spencer Meyer, continue to masturbate on the spot.
Dude, I just took a grand slam dump. It was awesome. Thats the second one this month!
Grand Slam Dump by Jizzman69 January 20, 2008

slumdumpster 

A particularly easy-to-use repository for cum, typically a female of much lower class.

Etymology: Probably a portmanteau of Middle English "slut" and Modern English "cumdumpster," but possibly a portmanteau of "cumdumpster" and Modern English "slum."
"I love my wife, but she doesn't alway satisfy me, so sometimes I have to drive down to the projects and find a slumdumpster to drop my load in."

"Our cleaning lady can't clean worth shit, but she's cheap, and she lets my roommates and me use her as a slumdumpster. Saves on tissues!"

"Mark's girlfriend doesn't like to swallow, so she hired a cheap slumdumpster to dump his wad in when they're done."
slumdumpster by Jackie Ho September 22, 2011

slam dump 

To defecate inside another human being's anus.
I got you Sharon! Right in there! SLAM DUMP!

Last night Steven took it upon himself to slam dump inside me. It was pleasant.
slam dump by Bruce Fidler November 26, 2007

slam dump 

when you have to take a dump really bad and you get to the toilet and you start to shit before you even sit down, but you still make it
Mike: OH SHIT! i think im running to a SLAM DUMP
slam dump by shailah December 13, 2008