drop the del
The act of having a of bowel movement, defecating, dropping the deuce, crapping, pinching one off, going poo, taking a dump, basically having a real good shit.
Mary asked Scott "Where are you going?" as she noticed the newspaper tucked under his arm and the book of matches held in his hand. It instantly dawned on her he had a pressing need to go poo. No sooner had she come to this conclusion when he confirmed her suspensions with a quick, loud, fart, followed by an almost immediate reply. Scott's answer was prompt and to the point, "Well, its about time to drop the del!" he said with a pleased look on his face.