When the string from a girls thong turns brown from close contact with an unwashed ass.

when you're hungover as shit after a spending a night drunk as a skunk

When you use a dick to fuck someone in there bum bum when they have to poo, and when they are about to cum pee out your poo noodle in their mouth.

Further more you can upgrade to the "Chocolate Spaghetti with Tomato Sauce" in which the penis owner dips into a menstruating giney before feeding the aforementioned poo noodle to its victim.