vegetariantarian 

one who only eats vegetarians.

Bob: Liver?
Betty: No thanks- I'm a vegetarian.
Bob: Better watch out then, because I'm a vegetariantarian.

vegetariantarian by cannothascheezburger November 30, 2009

vegeterianarian 

Someone who eats only vegetarians.

JR: "Hey, let's go eat someone."
Me: "We have to make sure they're vegetarian first. I'm a vegeterianarian."

vegeterianarian by PhyllisDean August 6, 2009