What is a human leach?

A human leech is a term often used colloquially to describe a person who exploits others for personal gain, typically by taking advantage of their generosity or resources without offering anything in return. This metaphorical usage draws a parallel to the way leeches draw blood from their hosts, emphasizing parasitic behavior in relationships. In social contexts, human leeches may be seen as manipulative or overly dependent individuals who drain the emotional or financial resources of those around them.