This threads definition goes as follows:
Controlling anything, including your own characters actions, that can drastically effect the battle in a way that is not realistic.
Wiki answers gives 5 decent examples:
In roleplay, it means trying to exert too much control over the plot and other characters, usually because the player has no concept of in character or out of character and is there to "win" and satisfy their ego rather than be creative and collaborative. Examples:
1) Invincibility
Creating a character so powerful and invulnerable that it cannot take any damage, be incapacitated or hindered, lose a fight, feel pain etc.
2) Dictating other players' responses
Swinging a punch and telling the other player that they are down, that they are unconscious, cut, dead or whatever.
3) Impossibility
Drawing a knife when your hands are tied. Pulling a bow out of your rectum when you're on the ground and hogtied (I wish I were making this up). Drawing a bow out of your rectum at all, come to that. Being held by the hair and with a knife at your throat but whizzing round and slapping your captive and disarming them.
4) Just plain silliness
Taking the plot to asinine turns purely to avoid your character having to suffer a misfortune too weak for your manly fictitious self. Being shot at and deflecting the bullet with a penny on a string so that it flies back up the gun nozzle. Again, I wish I were making this up.
5) Anything that is used to let one character force the plot and does not enable the story to be a properly collaborative effort with plausibility.
Read more:
http://wiki.answers.com/Q/What_is_go...#ixzz1gus7kBup