When (mostly) fat girls do not style or maintain their long hair properly. They just get out of the shower, comb it, and let it "air dry". It then looks nappy, greasy, frizzy, and disgusting for the rest of the day. This is not a one time deal, this is their constant look.
Stacey: "What is up with your Sister in laws hair?! Does she know what a blow dryer is?"
Kelli: "No! She has fat chick hair..and she thinks it looks good!"