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A heated argument concerning a topic that the general population typically cares little about, such as string theory, Crispin Glover films and Zelda. Can often be found on Internet message boards.
Joe: "The Sega Dreamcast was clearly the most underrated console system of all time."

Jim: "Have we forgotten about the 3DO, my friend?"

John: "I'm sorry, but I'm going to have to interrupt this nerdument."
by mikeity mike mike December 18, 2007
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