Being greedy means you want more and more of something, especially money. But you can be greedy for just about anything, including food, drink, or fame.
People who are greedy are a little too interested in having something. Usually, that something is money. Rich people who keep trying to get more and more money are often accused by being greedy. A gluttonous person is greedy for food. If you're obsessed with something and can't get enough of it, you're greedy for it. This is a word for extreme, grasping, devouring behavior.