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Abbreviation of February. [The short month following January and preceding March in the Roman, Julian, and Gregorian calendars, used in all three calendars for intercalation or addition of leap days.]

(Internet) Abbreviation of Facebook. [(trademark) A social-networking website where users can find acquaintances or friends, exchange messages, and post updates.]

Initialism of fuck buddy. [(vulgar, slang) A sex partner with whom one has sex, usually repeatedly, but without any romantic attachments.]

(Internet slang) Abbreviation of femboy. [A (typically young) male or non-binary individual who adopts a feminine aesthetic and has an androgynous appearance.]

Initialism of friendship book. [A decorative stapled booklet or similar, made by a person who writes their name, address, interests etc. inside and gives it to a friend or pen pal. The book is passed on from one person to another, each adding their own details, and eventually returned to the originator.]

(military) Initialism of firebase. [(military) An encampment designed to provide indirect artillery support to infantry troops operating beyond the normal range of fire support from their own base camps; a fire support base.]

(military) Initialism of forward base.

(US, military, aviation) Initialism of fighter-bomber (used as a prefix) [(military aviation) A military aircraft designed to operate in combined roles of attacking enemy aircraft and bombing targets; usually faster and more maneuverable than a traditional bomber.]

(soccer) Initialism of fullback. [(American football) An offensive back whose primary jobs are to block in advance of the halfback on running plays and for the quarterback on passing plays.]

(sports) Abbreviation of final B.

Abbreviation of football. [A sport played on foot in which teams attempt to get a ball into a goal or zone defended by the other team.]

(Internet slang) Abbreviation of follow back.