| Abbreviation | Definition |
|---|---|
| MUG | Multi User Groups |
| MUM | Mother |
| MUM | Quiet |
| MUN | Money |
| MUP | Most Unusual Place |
| MUS | Must |
| MUSE | Multi User Shared Experience |
| MUSH | Multi User Shared Hallucination |
| MUSL | Muscle |
| MUSM | Miss You So Much |
| MVOC | My Very Own Cancer |
| MVOL | My Very Own Lith |
| MW | Mad and Wild |
| MW | Many Words |
| MW | Moaning and Whining |
| MWAH | Messages Which Are Hopeful |
| MWAHH | Onomatopoeia for a kiss. |
| MWE | My Words Exactly |
| MWI | Mad With It |
| MWILF | Mature Woman I'd Like to F*** |