The term 'Like Leeches' is used to describe something that is PARASITIC or PARASITICAL. Parasites are organisms that live off of other organisms, taking their nutrients and energy without providing anything in return. PARASITICAL behavior is similar, but it is usually used to describe a person or group of people who take advantage of another person or group of people for their own benefit. This type of behavior is often seen in relationships, where one person takes advantage of the other for their own gain.