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When a person gets on a toilet to defacate, only to be sat on top of by another person who defacates between his or her legs. There are three variations: standard, where both people face forward; the side-saddle, where the top person sits like a child on Santa Clause's lap; and the reverse, which allows the two people to make out with each other while defacating.
Jim: "So last night after my girl and I finished making love, I went to the bathroom to relieve myself, and she in her passion joined me in a dump and stack to further prove her love to me!"

Brandon: "Jim, what the FUCK..."
by Kamui Takahashi September 29, 2009
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