| | AAM | | mango |
| | ANOCOVA | | mean analysis-of-covariance |
| | bad | | mal |
| | dil | | mind |
| | DOR | | mild |
| | el | | my |
| | fica | | more of |
| | fir | | men |
| | giro | | money |
| | gos | | meat |
| | imae | | Monthly Index of the Economic Activity |
| | KGB | | marijuana |
| | ko | | me |
| | ko | | my |
| | la | | my |
| | lun | | Monday |
| | luna | | moon |
| | M&A | | mergers and acquisitions |
| | M&A | | Mergers and Aquisitions |
| | M&IE | | Meals and Incidental Expenses |
| | M.B.A. | | Master of Business Administration |
| | M.C. | | Master of Ceremonies |
| | M.I.A. | | missing in action |
| | M.I.L.F. | | Mother I’d Like to f**k |
| | m.i.l.t.f | | mother I'd like to f**k |
| | M.I.L.T.F. | | Mother I’d Like To f**k |
| | m.M.n. | | meiner Meinung nach |
| | m.m.o.b. | | minding my own business |
| | M.M.S. | | Multimedia Messaging Service |
| | M.O. | | Modus Operadi |
|