The lady with the human hair ball

I ride the bus with a lady who has not combed her hair in years. Her hair has formed into a huge lump in the back of her head and it looks like something a cat threw up, literally. When the woman moves her head around the thing moves in a stiff lump and looks like the back of the alien queen's head in the movie Alien. People on the bus will do anything to avoid getting touched by this woman's disgusting hair ball. She is a white hippie chick, who is otherwise clean and normal looking, so it's hard to understand why she won't just cut it off if she doesn't want to bother to comb it.
Today I was trying to comb through my thick hair at work and I told my co-worker that I was just going to give up and let it form a human hair ball. My co-worker said, "No, no, you are not!" "If you try, we will have to stage an intervention!"