What does RDM mean? Give at least 1 example situation.
Random Death Match. Example: A prisoner spawns in their cell with a knife automatically equipped. A guard approaches the front of the cell and opens fire on the prisoner, killing them without ordering them to drop their knife or giving them a chance to obey the order.

You were asked for the definition, not for the acronym.

What would you do if a player breaks RDM?
Kick them, if they repeat their offence I would eventually ban them for a period of time.

You should warn them first, and moderators can not ban.

What would you do if a player ghosts/metagames ?
Kick them and if they are repeat offenders I would ban them for a period of time.

Same for here.