Duck Butter is the gooey substance that is formed next to the ball sack and in the butt crack. This is formed by lack of hygiene, long days of arduous sweaty work, and native americans. Duck Butter is made up of oil, sweat, dirt, and sometimes cum stains. This mixture of components under the proper temperature, humidity, and friction, forms a buttery substance that leaves stringers when your balls are seperated from the inner thigh, or when you spread your butt cheeks. Colors can vary from brown, yellow, white, to an occasional green. The consistancy is that of mucas.
Person 1: "We don't have any margerine for the grilled cheese sandwhiches."
Person 2: "I only have some Duck Butter; however, we should probably not use it."