"M o" is a slang term that refers to the act of killing someone; it is a shortened version of the word "murder". However, there are many synonyms for this word that can be used in different contexts and situations. Some of the common synonyms for "m o" include homicide, assassination, slaughter, extermination, elimination, and execution. These words are often used to describe the violent taking of a life, whether intentional or accidental. It is important to note that the use of these words must be approached with sensitivity, as they can evoke strong emotions and are often linked to traumatic events.