Nombie, being a "head-bashed Zombie", can also refer to, in reality, a person who is somewhat dim-witted, slow, or possibly takes thing too literally, doesn't get jokes, etc.
We were trying to explain the concept to Dingledorf, but, he just didn't get it. After 2 hours, we gave up. We started cracking jokes about him after that, in his presence, but it was cool, because he didn't get that either! What a Nombie!!!