A Zexion is World Of Warcraft slang for somebody who overly brags about their items / achievments manily in guild chat and will at any oppurtunity try to upstage anybody who releases information about his or her Items / Achievments.
To do a 'Zex' is to link in items continuously to the annoyment of fellow guild members and thriving on having better or higher level items or completing better or higher level tasks. Typically a 'Zex' would also report players to World of Warcraft administrators for extremly minor offences.
The word originates from the Super Friends guild on the european server Dunemaul where a player was accepted into the guild only to repeatedly annoy fellow members.
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