| FABIANS | Felt Awful But I'm Alright Now Syndrome | - | NASA |
| FAC | F*cking Awkward Client | - | NASA |
| FCBP | Fellow Of The College Of Bystander Physicians I.e. Doctor Having A Look-see | - | NASA |
| FD | F*cking Drunk | - | NASA |
| FDGM | Fall Down, Go Boom (also See LOLFDGB) | - | NASA |
| FDSTW | Found Dead Stayed That Way | - | NASA |
| FES | Fluttering Eye Syndrome - Patient Faking Unconsciousness | - | NASA |
| FFDID | Found Face Down In Ditch | - | NASA |
| FFDIG | Found Face Down In Gutter | - | NASA |
| FFFF | See 4F (Fat, Fair, Female, Forty = Gall Bladder Disease) | - | NASA |
| FHHS | (US) Female Hispanic Hysterical Syndrome (screaming And Crying) | - | NASA |
| FIDO | F*ck It, Drive On (a Waste Of Time/hoax Ambulance Call) | - | NASA |
| FINE | F*cked Up , Insecure, Neurotic & Emotional | - | NASA |
| FIRT | Failed Impact Resistance Test (crash Victim) | - | NASA |
| FIT | Fart In Transit (gas Seen In The Intestines On An Abdominal Film) | - | NASA |
| FITH | F*cked In The Head | - | NASA |
| FLB | Funny Little Bumps (unexplained Skin Bumps) | - | NASA |
| FLK | Funny Looking Kid (sometimes Suggests Rural Inbreeding - See FLP) | - | NASA |
| FLK W/ GLM | Funny Looking Kid With A Good Looking Mother | - | NASA |
| FLKBCOTP | Funny Looking Kid But Check Out The Parents | - | NASA |
| FLP | Funny Looking Parents (hereditary Cause Suspected For FLK) | - | NASA |
| FLUF | Funny Little Ugly F*cker | - | NASA |
| FMPS | Fluff My Pillow Syndrome (attention/sympathy Seeker) | - | NASA |
| FOALS NEIGH | F*ck Off And Let Someone Not Extremely Incompetent Get Here | - | NASA |
| FOB | Found On Bench | - | NASA |
| FODE | Falling On Deaf Ears | - | NASA |
| FOL | Fat Old Lady, Gone Off Legs (GOF), Full Of Sh*t(FOS). Confused Elderly Female, Unable To Exercise At Home, Now Unable To Move Unaided And Badly Constipated As A Result (see Also TCS). | - | NASA |
| FOOBA | Found On Ortho Barely Alive (a Play On FUBAR - F***ed Up Beyond All Recognition) | - | NASA |
| FOOSH | Fall Onto Outstretched Hand (as Cause Of Broken Wrist/arm) | - | NASA |
| FORD | Found On Road Dead | - | NASA |
| FOS | Full Of Sh*t (either Severely Constipated Or Metaphorically) | - | NASA |
| FOS | Found On Street: Unidentified Dead Homeless Person | - | NASA |
| FPO | For Practice Only (FTD) | - | NASA |
| FTD | Fixing To Die | - | NASA |
| FTF | Failed To Fly (botched Suicide) | - | NASA |
| FUBAR | F*cked Up Beyond All Repair / Recognition | - | NASA |
| FUBIL | F*ck You Buddy, I'm Leaving. The Act Of A Doctor At A Small Hospital Dumping A Critically Ill Patient On Larger Hospital On Friday Afternoon Before He Leaves For The Weekend. | - | NASA |
| FUPA | Fat Upper Pussy Area | - | NASA |
| FURB | Funny, Unusual, Rectal Blockage (people Who Use Inappropriate Objects To Insert Into The Rectum) | - | NASA |
