"God Modding" is in essence when someone’s character has the ability to do practically anything without limits or boundaries. And example is when they simply cannot be harmed by any and all means other RP-ers try.
-It can be killing or injuring a character without the player's express permission.
-It can be when they simply can’t be hit and dodge all attacks or anything for this matter aimed at them.
-It can also be using other characters that other people RP with. In other words, if you do not RP as
Legolas, then you cannot have Legolas say anything, or do anything, without the player's express permission.
The absolute worst is when they make out another character to be what they’re not, just to make their own character seem superior. They make others seem weak, screaming for help, when they’ve made it quite clear about their advantages and strengths. This is called power-play. It’s a strain of God-Modding, but instead of just being irritating, it’s offensive to boot.
This is a prime example of God Modding:
Player A: Punches Player B
Player B: Dodges attack, grabs Player A and throws him. Player A flies at Player B, who warps behind him and slashes Player A in the back.