Phi Pob – A malicious and very dangerous spirit which manifests itself as a beautiful woman. Phi Pob float through the air because they have no legs or lower body. They generally appear as a length of internal organs and intestines suspended from a strikingly lovely face – therefore, beware beautiful women gliding mysteriously by in long dresses! This type of ghost is probably more feared than any other species in Thailand. (source)
Thanks Filmrage Magazine for images.