usually a large blob or log of fecal matter shot and expelled from an anus in a most satisfying manner. A collection of these masses dropped in a fine deuce like manner will cause whats known as "breaking water". This is where the amount of turd is so great it stacks in a shape that breaks the precipice of toilet water level.
"go eat a turd sandwich"
"you are such a turd"
"I got to go turd my pants"