a person who is emotionally deficient and who is likely to "suck the life" out of another person to make up for that deficiency
the shorthand version of this phrase is (obviously) EBH
Hey, you look terrible! What happened?
I ran into my emotional black hole today and I don't think I'll recover until tomorrow. I'm dead-dog
She sucked the life out of you, big time?
EBHs always do, unfortunately.