An individual who uses online games, instant messaging, e-mail, or any other communication method to harass, obstruct, or in some way make an experience sour for another person.

Someone, usually in an online game, who intentionally, and usually repeatedly, attempts to degrade anothers experience or torment them.

Examples of griefing:

1. Player vs player abuse: Singling out the same person and killing them over and over when they are defensless until hey log off.

2. Kill stealing: Repeatedly trying to steal another persons kills so that their time is wasted.

3. Verbal abuse: Spamming a person with vulgar, hatefull, or offensive messages.

4. Blocking: Getting in anothers way so they cannot move or get out of a particular area.

5. "Training": Triggering many monsters, almost always impossible to fight and survive, with the intention to either run someone out of an area or kill them indirectly if the server is not 'player vs player' enabled.

Griefing in massively multiplayer online role playing games are usually bannable on first offense and less common (thoguh still visably present).

Griefing is much more common on private servers for first person shooters like Counterstrike and Battlefield 1942.

In online gaming, someone who purposely seeks to annoy the other players, especially his own teammates. Usually a griefer is someone who is not good at the game, has a poor internet connection and wants to vent frustration.