A girl who is a less severe case of butter face. She has a smokin' body, but her face is not happening. You wouldn't really brown bag her, but you'd close your eyes, or do her in the ass, so you can fantasize about someone else.
*A really hot girl walks by, but has an ordinary face*
Guy 1: shit son, I'd tap that, but I'd brown bag her
Guy 2: really? I think she's more of a fantasy fuck