food hog

By way of example: If there are eight slides of pizza for four people (each person getting two slices of pizza in a fair world), a food hog would be the person that ends up eating more than his or her fair share of food. In this case, this would be more than two slices of pizza, eaten with intent and greed, but as important, without the consent of others sharing in.

"Rick two an extra slice of pizza. Someone is going to end up with one less slice of pizza. Rick is such a food hog.