Ninehead
The term used to describe folks with a large forehead. It comes from the word "forehead," but theirs are just too damn large, so we refer to them as "ninehead." Now, if you've got a sense of humor, you'll realize that "fore/four" is a number, as is "nine." So, it's like saying "fourhead."

Oh, I'm so funny.
"Damn, that girl got a huge forehead."
"Son, that ain't a forehead, that's a ninehead."