Her hair is so shit it looks like that of a pube head.
This racial slur came about when some teenagers discovered a question about pubic hair in the book "Do Penguins Have Knees?" by David Felman. In one section of the book, it explains that pubic hair is always curly because the hair is oval in shape and that this oval shape is the same reason Africans generally have curly hair, thus spawning the term "pube head."
Please take note: Because of the striking similarities between pube heads and steel wool, it is not uncommon for Pube Heads to set off metal detectors, as well as often being asked to be an industrial cleaning tool for many school cafeterias.
"Yeah matt, that kid's name is Jack. He is a Pube Head for sure...but he does get laid often."