| Abbreviation | Definition |
|---|---|
| MC | Mindless Crap |
| MCC | Mind Change Complexity |
| MCC | My Cup Of Coffee |
| MCG | Moonlight Chat Galaxy |
| MCIGTD | My Computer Is Going To Die |
| MCL | Musical Chain Letters |
| MCM | Man Candy Monday |
| MCN | Most Certainly Not |
| MCOT | My Cup Of Tea |
| MCP | My Computer Page |
| MCPVP | Minecraft Player Versus Player |
| MCR | Meet Chat and Relax |
| MD | Mysterious Dude |
| MD | Mystery Date |
| MDD | My Dear Darling |
| MDER | Mic Drop Exit Room |
| MDF | More Desperate Friends |
| MDV | Masks-Distancing-Vaccines |
| ME | Mother's Extract |
| MEDC | My Easy Definition Category |