| Abbreviation | Definition |
|---|---|
| MBICS | Master Bates In Cupboard Secretly |
| MBN | More Bad News |
| MBNA | Many Big Nasty Accidents |
| MBNA | Money Buys Nearly Anything |
| MBNA | Money Buys Nothing Anyway |
| MBR | Master Boot Revaz |
| MBS | Master Bull Scooper |
| MBT | Masters Burning Together |
| MBT | More Bull Today |
| MC | Mad Cashier |
| MC | Mordor's Children |
| MCA | Musicians Cemetery of America |
| MCAS | Mitt Cares About Schools |
| MCC | More Cash Coming |
| MCI | Making Communications Impossible |
| MCI | Many Changes Instantly |
| MCI | Massive Corporate Indiscretions |
| MCI | May Create Insolvency |
| MCI | Measley Communication Imbeciles |
| MCI | Mentally Challenged, Inc. |