This is the 5684th most frequent German word.
blutsauger
"Blutsauger" means "bloodsucker."
Here, 'Blutsauger' is used as a noun referring to a mythical creature that drinks blood.
Der Vampir in dem Film war ein unheimlicher Blutsauger.
The vampire in the movie was an uncanny bloodsucker.
In this context, 'Blutsauger' is used metaphorically to describe exploitative behavior.
Solche Geschäftsleute sind wie Blutsauger, sie nutzen die Menschen aus.
Such businessmen are like bloodsuckers, they exploit people.
Here, 'Blutsauger' describes a blood-drinking insect, specifically mosquitoes.