pornstache UK /ˈpɔːnstæʃ/US /ˈpɔɹnstæʃ/ noun1 •(slang) A moustache that resembles one worn by an adult film actor, especially associated with the 1970s.This was a far cry from Hall's original look, which resembled a 1970s adult film star. With his bushy hair and magnificent pornstache, Hall could have easily doubled for a muscle-bound John Holmes. — 2007 formspornstaches