A term referring to the amount of fecal matter left over in ones undergarments as result of a large fart
(usually unintentional).
the room fell silent when all the party goers smelled Timmy's Shart Residue.
The wetness left over after you shit your pants that sticks to your underwear or between your buttcheeks
Kaden had some shart residue left after that juicy fart he let go.