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.
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Dumpmates (n)
When one or more people are in the same room as someone who is pooping, those previously stated are considered dumpmates .
Jan had to become dumpmates with her boyfriend when he was pooping, and she had to do her makeup in the same room as him in order not to be late.