The term 'person who sponges' can be summarized as a MOOCH, which is a person who takes advantage of the generosity of others without giving anything in return. This type of person often relies on the kindness of friends and family for food, money, or other resources. They may also take advantage of free services or goods without contributing anything in return. Mooching is generally seen as an unethical behavior and is frowned upon by society.