Any moustache, beard, sideburns, or any combination of aforementioned types of facial hair grown in such a way, or worn by such a person, as to convey a sense of creepiness; short for 'molester moustache.' Originally coined by
Abraham Finkbeinner in some filthy frathouse basement.
Isaac, you filthy man! With that woodland camo hat, plaid shirt, and tattered jeans, your otherwise respectable facial hair has become a Molestache!!
Look at that creepy guy in that panel van, with the mullet and Molestache.