| Abbreviation | Definition |
|---|---|
| MCI | Mighty Crappy Internet |
| MCI | Money Coming In |
| MCI | More Company Indictments |
| MCI | Mostly Caucasians Intoxicated |
| MCI | My Company's Incompetent |
| MCI | My Creditors Insisted |
| MCI | My Crotch Itches |
| MCIB | My Cousin Is Bored |
| MCLE | Money Coming for Lawyer Enhancement |
| MCM | Making Conceited Moves |
| MCP | Male Chauvinist Pig |
| MCP | Management Completely Pathetic |
| MCP | Microsoft Crappy Program |
| MCR | My Chemical Romance |
| MCS | Messy Crackpot Service |
| MCS | Microshaft Certified Sales |
| MCSA | Musta Cost Someone Alot |
| MCSE | Making Computers Slow Everyday |
| MCSE | Marginally Competent, Seriously Expensive |
| MCSE | Microshaft Certified Systems Engineer |