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(noun) someone who is extremely needy to the point where they start to suck actual years of your life away
My father won't live past the age of 55 because my brother is such a life-sucker.

"Dude, I don't know why he didn't call back. Maybe he realized that he already lost a year of his life from going out with you one time."
by Dan to the Elle March 30, 2006