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1.
1. Purposefully shooting or otherwise sabotaging your teammates in an online game.

2. In online gaming where one repeatedly killing the same individual or individuals over and over again, or camping their corpse to prevent them from retrieving it, or otherwise performing actions in a game to prevent the player from enjoying the game.

3. In online gaming, someone who takes pleasure in creating grief for an opponent via various "cheap" tactics.
I wish Jork would stop friggen griefing my guild mates everytime we log in and play.
by [LK]Myrik December 10, 2004
 
2.
Griefing has many different types, and occurs in many different games.

General Griefing:

1: Training, or angering hostile mobs to chase you at another player. This is named because the chain of mobs looks like a train.

2: Camping, or killing a player, then killing them again at their point of death or the spawn.

3: PVP stalking, or stalking a player and continuing to kill them. This is similar to camping, but occurs with the same player for a long period of time.

4: Chat spamming, or adding random text or profanity into the chat.

Specific Griefing:

Sandbox Games

5: Spleefing. This is very annoying if this occurs outside a designated spleef arena.

6: Walls. Self-explanatory, but must be constructed out of a high-level material that cannot be easily destroyed. This is also used to defend against griefers.

7: Encasement in walls. Normal walls, but surrounding a player so s/he can't get out.

FPS games

8: Sniping. This is normally not griefing, but is a form of the PVP stalker.

Targets for Griefers:

1. Minecraft. This game is a sandbox game, and is easily griefed. This game is particularly good for griefing as almost-indestructible structures can be built out of obsidian and used for walling and encasement.

2. World of Warcraft. This game is very popular, and thus griefed often.

3. Terraria. This game is very similar to Minecraft, as both were based off the game Infiniminer, and thus is griefed in very similar ways.
Steve: Finished my house!
(explosion, due to creepers)
Herobrine: Griefed you!
Herobrine was banned from the server.
Steve: pwned

Above, a common form of griefing in Minecraft.
by RedstoneAurora April 03, 2013
 
3.
Doing something to a player (in a video game) that he/she cannot get out of through means provided by the game's design.

This does not involve emotional things, such as butthurt, as they are psychological issues that are brought up by the individuals themselves and can be caused by anything.

Camping and ganking are often considered griefing by ignorant people and also are called grieifing by thin skinned people who cannot deal with what is involved in playing a particular game or ruleset provided by a game.
"A player griefed a carebear by exploiting the game's system. The player was able to teleport to wherever the carebear was and could not be attacked or targeted."

"Joe Bob hacked the game and found personal information and is now griefing a targeted player with it."
by Johnny Gank October 27, 2011
 
4.
The action of causing someone grief in a video game.
Common in Call of Duty, Minecraft and a few other video games.
In minecraft it is using hacks to destroy something that someone has made, or just use hacks to kill them.
In COD it's using stuff like fly, forcefield, aimbot and ESPs.
Do not attempt griefing in real life, you may get hurt by the person you are griefing.
Joe: Bobby is griefing my new house!
*No response*
Joe: HELP ME HE'S BREAKING MY STUFF!
Bob: Shut up I'm not where near your house you liar.
*Bob warps away*
Joe: WHERE DID HE GO!?!?!?!?
*Bob comes back*
Joe was slain by Bob.
Joe left the game.
by Not New Username November 14, 2012
 
5.
Purposefully shooting or otherwise sabotaging your teammates in an online game.
We were winning the capture the flag game until Brian and Chris decided to started griefing and shot the rest of us in the back.
by Industrio Melman May 01, 2004