A poop stache is the remnant hairs or ingrown hairs that are still visible on a guy's upper lip even after they shave. No matter how many times they shave it still stays there. A poop stache is most noticeable on guys who grow hair mostly on their upper lip and nowhere else on their beard or sides of their faces; this makes it look even more like shit.
Evelyn: "Look at John, isn't he a hottie?"

Abby: "Yeah, too bad he has a poop stache"
by brittany snow February 02, 2008
A thin, weak, fine collection of hairs on the upper lip that is noticible but not technically thick enough to be considered a real moustache. They are usually found on pubescent boys aged 13 to 16 whose moms won't buy them razors.
Mom i know i'm only 14, but i seriously need a razor. I have a poopstache, for christ's sake!
by ihatebuffering March 06, 2011
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.
by Eva Westberg April 29, 2008

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