When someone has a flexible diet. They are not vegetarian, pescatarian, vegan, carnivores...they eat everything and donāt discriminate on their food.
Someone who is primarily vegetarian but crab be non-vegetarian or eggetarian or pescatarian etc. depending on their mood, day, place of food etc. For example, i am primarily vegetarian by choice but there are a select few restaurants where I like their chicken. I chose to be non vegetarian ONLY in those restaurants otherwise I'm vegetarian.