| Abbreveation | | description |
| FOAD | | Fuck Off And Die |
| FC | | Fingers Crossed |
| FWIW | | For What It's Worth |
| FYI | | For Your Information |
| FAQ | | Frequently Asked Questions |
| FOTFLOL | | falling on the floor, laughing out loud |
| F2T | | free to talk |
| FRM | | from |
| 4EVER | | Forever |
| F2F | | Flesh to flesh or Face to face |
| FAB | | Features, attributes, benefits |
| FAI | | Frequently argued issue |
| FBKS | | Failure between keyboard and seat |
| FBOW | | For better or worse |
| FE | | Fatal error |
| FFPN | | Fresh fields and pastures new |
| FO | | fuck off |
| FOAF | | Friend of a friend |
| FOCL | | Falling off chair laughing |
| FRED | | fucking ridiculous electronic device |
| FTASB | | Faster than a speeding bullet |
| FTL | | Faster than light |
| FTTB | | For the time being |
| FUBAB | | fucked up beyond all belief |
| FUBAR | | fucked up beyond all reason / recognition / repair |
| FUBB | | Fucked Up Beyond Belief |
| FUD | | Fear, Uncertainty and Doubt |
| FYA | | For your amusement |
| FYIFV | | fuck you, I'm fully vested |
| FYIV | | fuck you, I'm vested |
| FYM | | For your misinformation |
| FYYSOS | | Fuck you, you sack of shit |
| 4FRNFR | | Forever and Ever |
| FAQL | | Frequently Asked Questions List |
| FAWC | | For Anyone Who Cares |
| FF | | Friends Forever |
| FISH | | First in, Still Here |
| FITB | | Fill in the Blanks |
| FOC | | Free of Charge |
| FOFL | | Falling on Floor Laughing |
| FWD | | Forward |
| 4 | | Four |
| 5 | | Five |
| FBUGLY | | Fucking Butt Ugly |
| FUBIO | | Fuck You Buddy I'm Out |
| FTTYYGTS | | Fart That Tells You You Got To Shit |
| FTMFW | | For The Mother Fucking Win |
| FTMFWB | | For The Mutha Fuckin Win Bitches |
| FTITM | | First Thing In The Morning |
| FTBSITTTD | | Fuck The Bull Shit It's Time To Throw Down |
| FTFTFWMF | | Fuck Them, Fuck Those Fucking Worthless Mother Fuckers |
| FSCK | | File System Check |
| 4 | | for |
| FTW | | For The Win |
