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A nerd (e.g. musical, computer, or academic nerd) that deviates onto their favorite subject while engaging in conversation with an unsuspecting person, sucking the entire conversation of any discernible interest, joy, or understanding.
Tom's bumbling conversation with Judy on Balkan politics in music class was a testament to the fact he was a true nerdjacker.
by arellan July 16, 2011
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