An otherwise straight person who occassionally engages in sexual relationships with members of their own sex, though not neccessarily often enough to be truly considered bi. Particularly popular with women; some husbands and boyfriends encourage this behavior in their women. See also LUG and sexual tourists.
Though Sue was married and had three children, she was a dabbler who slept with other women every so often.
F2 (F squared or FF) is an acronym for fuckable fifty, a woman in her fifties that is still sexually attractive to younger men. The ideal F2 is a woman who maintains her good looks through exercise and a sense of style, not through cosmetic surgery.
Donna worked out 5 days a week and ran three miles a day and was secretly flattered to know that the college guys who worked for her considered her an F2.