| Abbreviation | Definition |
|---|---|
| FAT | Fresh Air Thursdays |
| FAT | Frustrated, Angry, and Tired |
| FATASS | Federal Air Transportation Association |
| FATHER | Farsighted, Administrator, Teacher/Trainer, Highly respected, Executer/educator, Receiver/Rewarder |
| FATZ | From A To Z |
| FAV | Family Assault Vehicle |
| FAYAH | Fortunately Average Youth Average Health |
| FAZE | Fat And Zoned Everday |
| FB | Fake Boyfriend |
| FB | Fark Boy |
| FB | Fish Bulb |
| FB | Funny Bunny |
| FBA | Franchise Basketball Association |
| FBAWTFT | Fantastic Beasts and Where to Find Them |
| FBC | Fake Broadcasting Company |
| FBCI | Feline Bureau of Claw Investigations |
| FBI | Facilitators of Banner Instruction |
| FBI | Famous But Incompetent |
| FBI | Far Behind Intelligence |
| FBI | Farts Burn Intensely |