An international version of the Scandinavian "Fultal", literally: "Ugly Number". Simply the amount of partners a person has slept with, multiplied by the difference in age between the youngest and oldest.
Ex. 15 partners, youngest born 1985, oldest 1975, filth factor of 150.
Ex. 15 partners, youngest born 1985, oldest 1975, filth factor of 150.
- Karen spent the night at that 65 year old's place.
- Oh my god, her filth factor must have gone through the roof!!
- Oh my god, her filth factor must have gone through the roof!!
by Carl Philip March 11, 2008
Get the filth factormug.