A marijuana smoking vampire. They will typically creep into your house, steal your weed, smoke all of it in front of you, and then kill you.
The most traumatic part of an encounter with a dank vampire is he smokes all of your dank in front of you.
Dude, did you hear about that dank vampire on the block. He stole Fred's dank, smoked it all in front of him while he was tied up, and then 187'ed Fred.
Watch out for the dank vampires!