When a male (or woman) eats the ass of their partner and develops a visual ring around their mouth. Occasionally the visual Ass-Stache can be accompanied by a foul scent and may persist for days. There is no known antidote or medical treatment. Victims are advised to scrub affected area with equal parts bleach, water and 3 day old lime rinds.
Eric developed a bad case of ass-stache after going to town on Melanie’s back end last night.
As the name implies, the phrase Pedo Stache, short for 'Pedophile" Mustache, is a small, patchy "mustache" that makes it's owner look like a Pedophile.