| Word | Explanation |
| Mack Daddy | Ladies man |
| Madrox, Jamie | Member of Psychopathic group Twiztid. Third member of Dark Lotus. |
| Maggalo | A maggot of Slipknot fan who is also a Juggalo |
| Mainstream | Artists in the music industry that became famous by either knowing or being signed on by someone already famous, and did nothing else to get where they are today. |
| Majik Recordz | A Sub-Label of Psychopathic Records started and run by Psychopathic's Twiztid. This project has been canned, or at least put on hold for the time being |
| Marz | Former Psychopathic Records Artist, was part of Dark Lotus before having a "Falling-out" with the rest of the Label. |
| MCL | Much Clown Love |
| MFL | Much Family Love |
| MMFWCL | Much Motha Fucking Wicked Clown Love |
| Mile Roads | How Detroit is divided up by "class." The higher the number mile, the farther from Detroit. 5-8 Mile are in Detroit city limits. 8-10 Mile are trashy suburbs. 10 Mile on up are safe suburbs. |
| Monoxide Child | Another Member of Psychopathic Record's Twiztid and fourth member of Dark Lotus. His real name is Paul Methric. |
| Moon Glorious | Alter ego of Violent J, Shaggy Show Superstar, a simple, very sensitive guy |
| Moonshine | Homemade booze |
| Morton's List | Controversial game created by Rob Bruce and two others. Said to be the end to boredom. |
| Muggalo | Someone who is not a juggalo |
| Murder Clown | A pimp ass ninja |
| Murder Go Round | ICP's version of a Merry Go Round. The Murder Go Round is like kharma. If you kill (or hurt) someone, one of the victim's homies will come back around and return the favor. |
| Muthafack-O | Mother fucker. Said by J a lot in Big Money Hustlas. |
| Myzery | Myzery is a former Psychopathic Records Artist from Puerto Rico, who moved to the South Bronx when he was young. He has been featured on many ICP songs, and has his own Psychopathic Records release entitled "Para La Isla", which means "For the Island" in Spanish. Myzery was released from the Label, because of his having too much of an "Eastside" sound. |
