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An exclamation, much like owned or pwnt in which a person (the "posiedoer") extremely embarrasses another (the "posiedoee"). The posiedoer is not allowed to call a posiedo on himself, and the majority of cases neither is the posieoee.
Meriadoc: "Get in position Balbanes."
Balbanes: "Shut up Meriadouche."
Toga: "Posiedo!"
by r00ts October 13, 2005
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