- FU (Smoke (METAR Code))
- FUA (The Fuel Use Act (US))
- FUAC (Functional Area Code)
- FUB (Fulleborn Airport)
- FUBA (Friends United Block Association)
- FUBAR (Fouled/Fucked Up Beyond All Reason/Recognition/Repair)
- FUBU (Farmers Used to Beat Us)
- FUC (Father Urios College)
- F.U.C.K. (Fornication Under Consent (of the) King - Always used correctly by an NCO as a Verb, Noun, Adjective, Adverb, Pronoun, Preposition, Conjunction,Interjection.)
- FUCK (For, Unlawful, Carnal, Knowledge (Van Halen album title))
- FUCO (Foreign Utility Company)
- FUCT (Fabulous Unnamed Chicago Tournament)
- FUD (Fear, Uncertainty & Doubt (marketing strategy))
- FUDGE (Fathers, Uncles, Dads, Grandpas, and Everyone)
- FUDS (Formerly-Used Defense Site)
- FUE (First Unit Equipped)