Someone who will reply to anything you say with a bible verse, strict words on how you shouldn't "be like the world", or a huge rant about how you are a terrible person. These people are always straight-edge, routine church goers and readers of the holy book. They also sound a lot like you're mother when they speak to you. Your usual bibleass also gives off a vibe that they have no idea what they are talking about.
Tim is such a Bibleass, he tells me I shouldn't drink or smoke cigarettes, and i'm 25 years old!