| M | Male | |
| M$ | Microsoft | |
| M/F | Male Or Female | |
| M21 | My Two Cents | |
| M8 | Mate or Friend | |
| MA | Mature Audience | |
| MD@U | Mad At You | |
| MD@UFN | Mad At You For Now | |
| MDIAC | My Dad Is A Cop | |
| ME2 | Me Too | |
| MGB | May God Bless | |
| MGMT | Management | |
| MHBFY | My Heart Bleeds For You | |
| MHM | Mm-Hmm | |
| MHOTY | My Hat's Off To You | |
| MIHAP | May I Have Your Attention Please | |
| MIL | Mother-In-Law | |
| MKOP | My Kind Of Place | |
| MMA | Meet Me At | |
| MMAMP | Meet Me At My Place | |
| MMB | Message Me Back | |
| MMFU | My Mate Fancies You | |
| MMOB | Mind My Own Business | |
| MOB | Mobile | |
| MOO | My Own Opinion | |
| MOOS | Member Of The Opposite Sex | |
| MORF | Male Or Female | |
| MOSS | Member Of Same Sex | |
| MOTAS | Members Of The Appropriate Sex | |
| MOTOS | Member Of The Opposite Sex | |
| MOTSS | Members Of The Same Sex | |
| MOTU | Masters Of The Universe | |
| MS | Microsoft | |
| MS | Miss or Mrs. | |
| MSG | Message | |
| MTF | More To Follow | |
| MTFBWU | May The Force Be With You. | |
| MTFBWY | May The Force Be With You | |
| MTG | Meeting | |
| MTH | Month | |
| MUAH | Kiss (Mwah!) | |
| MUSM | Miss You So Much | |
| MWA | Kiss (Mwah!) | |
| MYOB | Mind Your Own Business | |
| (-: to the Emoticons :-) |
