Someone who has a foul attitude, is rude to others, and makes life miserable for everyone else due to them bagging turds all day in a room by themselves.
The master of a retard, as commonly seen in public schools since the initial passage of the Individuals with Disabilities Education Act, which mandated the inclusion of retards into standard education settings. These retards need constant individual supervision from tardmasters.
"Dude, did you see that retard flip his shit in gym earlier? His tardmaster had to take him down!"
A prankster who throws a turd into a discussion. Superficially, they are just another participant. But in reality, they are less interested in persuading others than in making a splash.