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The act of simultaneously pooping on the lap and in between the legs of another person pooping.

Though commonly done with two people, the limits to cascading are endless. It really only depends on how many people the person on the bottom can have on his or her lap.
I used to read magazines while pooping, but ever since I started cascading with my roommates I haven't read a single page.
by SpringBreak10 September 21, 2010