Closet Carnivore

Somebody who claims to be a vegetarian, usually for the purposes of appealing to a guy/girl who is also vegetarian, however they secretly eat meat either at home or at restaurants.

Girl: OMG that boy is sooo cute, and he is also a vegetarian and has real respect for animals!
Friend: I saw him eating a hotdog on the way home from school yesterday.. he's just a closet carnivore