Just as a sneakerhead is someone addicted to getting sneakers
A headhead is someone addicted to getting head
Not to be confused with a bobblehead, chickenhead, head bandit or Karrine Steffans bka Superhead
"Wait, no, nigga, chill out. She doesn't ever give head, she just takes it. Girl's a straight headhead, but she doesn't do shit for the guy she's with."
"Oh... that's cool for her, I guess."