Usually involves a rude customer at a fast food resturant who then requires that theshort order cook reach into his pants and remove a handful of black curleys in order to "pepper" the food item.
Jake thought every customer at White Castle was rude because he was hung over so, he spent the day peppering everyones sliders.
The act of "peppering" or otherwise seasoning a public toilet seat. The pepper flakes themselves generally contain blood or fecal matter, or a combination of both. The term peppered originated due to the fact that the toilet seat will literally appear as if someone sprinkled pepper all over it.