Explanation of In-Game Rule 1: Offensive Language.

[Kane]

Rule 1 of our In-Game rules is no offensive language. This means you are not allowed to offend anyone on purpose. If you do this, you will be muted, depending on how serious it was. Continuous cases of offensive language will result in longer mutes, and possibly bans.

FAQ

Am I allowed to swear?
Yes, you are. However, not to the point where it becomes offensive.

Am I allowed to joke around with people?
As long as they know it's a joke.