In situations in which a temporary set of rules are necessary, Rule 13 shall always be "No one shall say bad things about another person". In addition to establishing a standard level of civility, it also forces the situation to have a minimum level of structure by requiring at least 12 other rules be created.
A word used in chatrooms to break an awkward silence or disrupt a serious argument. It's usage in the latter situation is generally followed by insistentsics to shut up (STFU) or to get out (GTFO), thus achieving the usual goal of using the word by shifting the ire of the room to a singular point rather then allowing to spread.
Person 1 to Person 2: "...and then, you Nazi Commie Hippy bastard, I'll-"