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A recreational activity involving the moving one's bowels on the dormat of an unsuspecting victim.

Persons skilled in "dumpmat" will bear specially modified "trapdoor" pants, which enable an individual to do the deed without having to drop one's pants or soil one's shoes.
Illustrious writer Tryan K. Traughn is highly skilled in the art of the dumpmat.
by NoodlePorn April 06, 2005