Knowledge of the rules

What does RDM mean? Give atleast 1 example situation.
Random Death Match (eg. Being a guard and shooting everyone you see.)

You didn't quite explain the rule itself and directly jumped to an example instead.

What does metagaming mean? Give at least 1 example situation.
A strategy, action or method used in a game which transcends a prescribed rule-set. (eg. Basically someone who comes onto the server not reading the rules and playing by their own rules.

The first sentence is a slightly modified sentence from Wikipedia. Also that's not the defintition of Metagaming. Metagaming is when one uses the OOC-chat to post IC information.