A griefer is a player in a multiplayer video game that purposely irritates and harasses other players.
The term was applied to online, multiplayer computer games by at least the year 2000 as illustrated by postings to the rec.games.computer.ultima.online USENET group.
A griefer is a player who does things in a game to deliberately cause annoyance ("grief" in the sense of "giving someone grief") for the griefer's own enjoyment or "lulz". Such a player is a particular nuisance in online gaming communities, since griefers often cannot be deterred by penalties related to in-game goals.
Due to its popularity amongst some users, instances of griefing have increased. Websites such as "griefermadness" have formed online communities where visitors can view griefing videos and images.
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