A number of friends of mine describe themselves as "Vegetarian" but then go on to explain that they don't eat meat—but do eat fish and poultry (plus, in one case, bacon).
In my books this is not Vegetarianism but I can't think of a polite word or phrase for it.
Note that these people are not acting from religious convictions, so that rules out dietary descriptors for specific religious restrictions.
Best Answer
Pollo-pescetarian: http://en.wikipedia.org/wiki/Semi-vegetarianism
I identify with this because I eat only chicken and fish, and "pollo" and "pesce" mean exactly these so it is correct.
For your friend who eats bacon, this does not apply.
Note that one should not eat bacon (or chicken, or fish) and call themselves vegetarian, it's completely false!