“扒灰”亦写作“爬灰”,是民间俗语,指公公对儿媳的乱伦行为。《汉语大词典·扒灰》条引用清代李元复的《常谈丛录》卷八的材料,以为“扒灰”盖为污媳的隐语,膝、媳同音,“扒行灰上,则膝污也。”《汉语大词典·爬灰》条引用清代王有光《吴下谚联·扒灰》的材料:“按昔有神庙,香火特盛,锡箔镪焚炉中,灰积日多,淘出其锡,市得厚利,庙邻知之,扒取其灰,盗淘其锡以为常。扒灰,偷 “Pa Pai” is also written as “Climbing Gray” and is a folk saying that refers to incestuous behavior of the father to daughter-in-law. “Chinese Dictionary Dictionary Pa Pai” refers to the Qing Dynasty Li Yuanfu's “Chang Bu Cong Lu” volume eight of the material, that “Pa Pai” cover foul language, knees, daughter-in-law, Dirty too. “” Chinese Dictionary Dictionary climbed gray “Article quoted the Qing Dynasty Wang Youguang,” Wu under the proverb together Pa Pai “material:” According to the temples, incense Te Sheng, tin foil furnace, the ash plot day , Amoy out of its tin, the city profits, Temple adjacent to know, take its gray, stolen its tin stolen.