I vegetarian that eats fish.

When you eat dirt for the first time and leave your family to build a shack in the woods

A person who tries to wear a "I'm saving the animals" badge, with going to little to no effort, by eating fish instead of our 4-legged friends (GM Chicken).

They are considered annoying, as they have no moral grounding, hence the play with words, "Pesky"+"tarian".

What vegetarians / veggies eat, as most people know, can easily be explained - they will not anything which was once part of a sentient being with a face, pretty simple. However there are those who call themselves vegetarians but still devour atleast one species usually the poor fish, occassionally the innocent little chicken - hence they have become know peskitarians.