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When someone (Referrably from Everquest) plays two characters at once (seperate accounts) either to group,raid, or powerlevel.
Hey can I get a heal?.....Hey you there?. Dude, he's two-boxing and powerleveling his lowbie.

Jeesh you got two accounts? Do you just two-box your all day with your guys?
by Dr. Demented January 15, 2004
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Three-way sex involving two men, one woman, in a double penetration manner. Usually involves video games due to boredom.
Ray and Ben were Two-Boxing Janet while playing World of Warcraft.
by Truedusk April 22, 2010
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