n. a person or collective group of people who focus exclusively on personal gain, draining whatever they can either mentally, emotionally or spiritually from others, without any thought of reciprocation or giving in return. To take without giving.
That soul sucker always leaves me feeling empty and cheated.
(n.) A jaded, stupid or unimaginative person who, by his/her negative or ambivalent reaction to another person's enthusiastic plan or idea, or by a general malaise about everything, sucks the life force directly out of the other person's brain.
I don't discuss my plans around him anymore; I've learned the hard way that he's nothing but a skullsucker.
She's the worst kind of skullsucker: somebody who thinks that her ideas about what's "realistic" are helpful.
Every time I leave that skullsucker, I feel drained and one day closer to death.