Definition of Godmodding (or Godmoding)
In an online RP, Godmodding is the term used for those whom create a character that is, virtually, indestructible. This is frowned upon by other members of the RPG and is extremely annoying. This can also result in a possible (thread) ban.
Godmodding in general
Godmodding occurs when a player A describes an event, or a series of events he/she has taken against player B in the RP. The person who plays character B describes actions taken that completely nullify the original actions against them.
For example:
player A: "Joe strikes out at George firing a machine gun, launching a grenade at him and pulling down the walls around him."
player B: "Joe completely misses George as he dodges the bullets, picks up the grenade and throws it back and jumps away from the falling walls."
***SOMETHING had to hurt the character, even if he only got shot in the shoulder or piled on by the wall and emerged with a broken wrist.Taking no damage isn't -always- godmodding, sometimes it is simply ineffective, like in a FT setting where a med-power kinetic energy blast hits one of the most powerful energy absorbtion/kinetic absorbtion shields/plating, or small arms/non-armor penetrating bullets against a tank in pretty much -any- setting, though PMT/FT have a little leeway
Godmodding is 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, a player will godmod to get things going their way. It is used to make a certain character invincible .
Godmodding can also refer to where character A describes the outcome of their own actions AGAINST another character. For example, character A states: "George lashes at Joe with his sword, creating a huge gash in his cheek."
Controlling characters that ARE NOT YOURS to begin with is also godmodding.
Godmodding during fight scenes
Godmodding is. most often, used during fight scenes. While it is hard to determine what another character will do, you must always leave the option open for them to dodge, duck, run, etc. You may not state your attack directly hit them and they fell down, or anything of that kind.
Godmodding and powerplaying/powergaming are, essentially, the same thing. In short, don't do it. It annoys other people and makes you look like a fool.
I haven't see your utterly-magnificent RPs, so you might be want to improve your own RPs rather than lecturing it to other people. And this: 
But many people are more capable to RPing than you, and only few of them have wrote stickied guides.