| Abbreviation | Definition |
|---|---|
| FLEGNARD | Floating Little Evil Gremlins Now Are Ridin' Dirty |
| FLF | Funny-Looking Face |
| FLG | Four Lucky Guys |
| FLIA | Florida Indian Accent |
| FLIRG | First Lady I'd Rather Gag |
| FLKO | Family Love Knows Others |
| FLNY | Family Loyalty Never Yields |
| FLOWER | Flavourful Love Of Wonderful Emotional Resonance |
| FLU | Fluids Leaking Unstoppably |
| FLYERS | Fun Loving Youth en Route to Success |
| FM | Free Money |
| FM | Fun Monkey |
| FMC | Freaks Management Crew |
| FMD | Federal Mogul Dragster |
| FMD | First Me Daddy |
| FMH | Frequency Modulation Heaven |
| FMJ | Fat Mean Jailer |
| FMU | Fbi's Most Unwanted |
| FNAF | Five Nights At Freddy's |
| FNAF | Five Noobs Are Fapping |