Biringan is one of the many 'folklores' that contribute to the 'notoriety' and 'mystery' of the Visayan region. In case you guys don't know, Visayans have a reputation among Flips for being superstitious, and dabbling with the occult and demons. Why do you ask, @Paul_Tromba ?
Visayas is the group of islands in the middle of the Philippine archipelago, sandwiched between Luzon (the landmass to the north), and Mindanao (the landmass to the south).