Porcelain Therapy

relieving yourself via the toilet after eating too much thus making yourself feel better; most commonly done after eating at a buffet or other all you can eat type situation. i.e. taking a dump

-hey man, i don't feel so good. i think i ate too much at the buffet
-yeah me too, let's go get some porcelain therapy.
-what is that? where can we get it?
-go to take a dump in the bathroom
-oh! i love porcelain therapy!