| MAFAT | Mandatory Anasthaesia F**k Around Time, Precedes Any Incision | - | NASA |
| MARPS | Mind Altering Recreational Pharmaceuticals | - | NASA |
| MCBP | Member Of The College Of Bystander Physicians I.e. Doctor Having A Look-see | - | NASA |
| MFB | Measure For Box (coffin) | - | NASA |
| MFC | Measure For Coffin | - | NASA |
| MFD | Measure For Dispatch (coffin), (severely Ill Or Dying) | - | NASA |
| MGM | MGM Syndrome (as In The Movie Maker) - Faker Putting On A Real Good Show | - | NASA |
| MICO | Masterly Inactivity And Catlike Observation | - | NASA |
| MICOS | Masterly Inactivity, Cat-like Observation And Steroids | - | NASA |
| MIDI | Myocardial Infarction During Intercourse (heart Attack During Sex) | - | NASA |
| MILF | Mother I'd Like To F**k. US Version Of GLM Who Is Also PHAT | - | NASA |
| MTF | Metabolize To Freedom (i.e. Let The Person Sober Up, And Then They Can Leave) | - | NASA |
| MU PAIN | Made Up Pain (especially For Sick Notes And Insurance Claims) | - | NASA |
| MUH | Messed Up Heart | - | NASA |
