Hachishakusama

Based on the Japanese urban legend, Eight Feet Tall (Hachishakusama, also informally called Hasshakusama) is a type of Japanese spirit (a Yokai) that takes the form of an impossibly tall female specter often said to have a deep, masculine voice in which she repeats the interjection "Po" [ぽ] repeatedly, and a habit of preying on children.

Source:
http://anomalyinfo.com/Stories/2008-aug-26-hachishakusan-eight-feet-tall