What does NSA, FWB, MBA mean? What does, fWB mean? 1 meanings of, fWB acronym and, fWB abbreviation in, dating. Get the definition. FWB in, dating by All Acronyms dictionary. What does the abbreviation FWB mean in personal ads? Top Definition: Friend With Benefits. Normally the benefits part means sexual access. FWB arrangement is not romantic and is more about scratching an itch - the desire to experience the physical part of sex without any committment. FWB: This one is a no-brainer. Friends with benefits is when people are in a sexual relationship but there is no love or any feelings involved.