When you have poop on your upper lip like a mustache. You can have many types of poopstaches in the form of a traditional mustache- like pinchers, goatee, soul patch, etc.
Dang it, I hate having a poopstache, it stinks worse than open cow ass.
See poop, mustache, moustache, feces, fecal, 2, two, poo, doodie
