One who's conception is the result of an accidental leakage and transfer of semen from the soon-to-be mother's anus to her vagina. Assuming the feces covered sperm reach an egg cell and successfully fertilize said cell, the outcome will be a rather poor excuse for a human child. This child (Butt Troll) will be forever ridden with terrible hygiene and an uncommonly low level of intelligence.
Brittany's parents should have paid a little more attention to their post-anal-sex clean up process. That girl is smelling up this entire building. I guess I wouldn't expect much else from a Butt Troll though.
by o ReVelatioN o May 13, 2010
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Mythical creatures used to explain gas, rumbling and other noises from the gut and rectal areas during periods of stomach discomfort, most notably as part of a hangover.
Tom: "Dude, was that a fart?"

Jerry: "I think it was the Butt Trolls"
by etafatdik June 19, 2008
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