| Code | Description |
| F%D | Food |
| f%t | Foot |
| f%ty | Footy |
| f? | Friends? |
| f2f | Face-To-Face |
| f2t | Free To Talk |
| F2T | Free To Talk |
| F8 | Fate |
| fa | f**k All |
| FAB | Features Attributes Benefits |
| faq | Frequently Asked Question |
| FAQL | Frequently Asked Questions List |
| FAQOMFT | Frequently Argued Waste Of My F*Cking Time |
| fas | For A Second |
| FAWC | For Anyone Who Cares |
| FBI | f**king Brilliant Idea |
| fbks | Failure Between Keyboard And Seat |
| fc | Fingers Crossed |
| fcfs | First Come, First Served |
| fcol | For Crying Out Loud |
| fd | Food |
| fdrotfl | Falling Down Rolling On The Floor Laughing |
| FE | Fatal Error |
| feiyd | Forever In Your Debt |
| fEl | Feel |
| FF | Friends Forever |
| ff&pn | Fresh Fields And Pastures New |
| ffs | For f**ks Sake |
| FGDAI | Stands For Fuhgedaboudit -Or- Forget About It |
| fGT | Feeling Great Today |
| fi | Forget It |
| ficcl | Frankly, I Couldnt Care Less |
| fiik | f**ked If I Know! |
| fil | Father-In-Law |
| FILF | Father I'D Like To F*** |
| FILTH | Failed In London, Try Hong Kong |
| FINE | F***Ked Up, Insecure, Neurotic, Emotional |
| fish | First In, Still Here |
| FITB | Fill In The Blanks |
| fl | Feel |
| FLA | Four Letter Acronym |
| FLIinCulrs | Flying Colours |
| flk | Funny Looking Kid |
| flm | Film |
| FMTYEWTK | Far More Than You Ever Wanted To Know |
| fntac | Fantasy |
| fo | f**k Off |
| foad | f**k Off And Die |
| foaf | Friend Of A Friend |
| FOC | Free Of Charge |
| fod | Finger Of Death |
| FOFL | Falling On Floor Laughing |
| FOMCL | Falling Off My Chair Laughing |
| fone | Phone |
| for | For Obvious Reasons |
| fos | Freedom Of Speech Full Of Shit |
| fot | Full Of Tripe |
| fOtbAl | Football |
| fotcl | Falling Off The Chair Laughing |
| fre | Frequently Requested Enhancement |
| FRED | F***Ing Ridiculous Electronic Device |
| frLng | Thrilling |
| frnd | Friend |
| frNZ | Frenzy |
| FSR | For Some Reason |
| fst | Fast |
| FST | Fast |
| FSU | F*** Shit Up |
| ftasb | Faster Than A Speeding Bullet |
| ftbl | Football |
| ftbomh | From The Bottom Of My Heart |
| FTF | F*** That'S Funny |
| FTFOI | For The Fun Of It -Or- For The F*** Of It |
| ftl | Faster Than Light |
| FTLOG | For The Love Of God |
| FTR | For The Record |
| FTRF | F*** That'S Really Funny |
| fts | Fixing To Start |
| fttb | For The Time Being |
| FTW | For The Win |
| FU2 | F*** You Too |
| FUBAR | F***Ed Up Beyond All Recognition |
| FUBB | F***Ed Up Beyond Belief |
| FUD | Fear, Uncertainty, And Disinformation |
| FUM | F***Ed Up Mess |
| funE | Funny |
| FWB | Friends With Benefits |
| fwd | Forward |
| FWIW | For What It'S Worth |
| FWIW | For What It'S Worth |
| fya | For Your Amusement For Your Attention |
| FYE | For Your Edification |
| fyeo | For Your Eyes Only |
| fyi | For Your Information |
| FYI | For Your Information |
| FYIFV | F*** You I'M Fully Vested |
| FYLTGE | From Your Lips To Gods Ears |
| fym | For Your Misinformation |
| FYSBIGTBABN | Fasten Your Seatbelts It'S Going To Be A Bumpy Night |