Griefing

From Second Life Wiki

Griefing is a term which applies to activities designed to make another player's life or experience in Second Life unpleasant. It can be applied to a range of actions, some of which are ToS violations, and others are debatable as to whether they are griefing. For example ad farms have been called land griefing.

Examples of griefing are caging, blitzing, or pushing, as well as spam of various kinds.