poop stache
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"
Abby: "Yeah, too bad he has a poop stache"