http://malkavian.wikidot.com/godmodding
Godmodding occurs when a character describes an event or a series of events he or she has taken against a player character in the RPG, with the person who plays the character acted against then describing actions taken that completely nullify the original actions against them. Godmodding is thus used like a "Get Out of Jail Free card" when things don't go the way a player wants, rather than working with previously unfolded events. It is also used as a single word definition of having an invincible character or unbreakable armor, limitless power, etc. For example, the following exchange would be godmodding on the part of player A:
* Player B states, "Having exploited A's mistake and caught hold of him, B strikes A."
* Player A states, "B completely missed A, and A takes no damage."
Godmodding at the expense of others
Godmodding can also refer to the case where a player describes the outcome of their own actions against another character. For example, player A stating, "A strikes B and B takes damage" would be considered godmodding on the part of player A in most situations. Another less common version of this is when a character is facing multiple enemies, and he directs an attack from one foe into another foe. This takes the format 'Player B states, "A misses B completely, and strikes C instead."'