Short for "fifty I'd like to fuck." It refers to an
attractive woman who is fifty or in her fifties, but still too young to be
considered a Gilf. A Filf is typically someone you find sexually appealing in that age range. While the term "milf" is commonly used for women in their 30s or 40s, a Filf specifically denotes an
attractive older woman in her fifties who catches one's eye.