1. One who promotes the devouring of animal flesh in an antagonizing way.
2. Those who are judgmental against Vegetarians, Vegans, &/or Fruitarians.
3. Someone who only eats meat or foods with meat in it.
Antonym: Vegetarian, Vegan
John is such a meatist. He even wears a PETA shirt but on the back it reads People Eating Tasty Animals and not People for the Ethical Treatment of Animals.