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The bathroom, or toilet. Often in reference to a port-o-potty, or other disgusting place to leave a sloppy one.
We can't leave yet, Mom is still in the dumper.

After eating all those beans -- refried and pinto -- I am going to have to spend some quality time in the dumper.

I didn't want to lay all that cement, so I hid in from the forman, in the dumper.
by Master Alexander June 13, 2010