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noun, pronounced "Spee-Oh" acronym for Self Proclaimed Expert On Everything The annoying know-it-all in everyone's social circle, or quasi-member thereof, who always insists on one-upping the person controlling a current conversation with useless factoids or name-dropping to make himself appear more knowledgable or superior to the audience in question. Considers himself (herself) the perfect candidate for "Jeopardy"
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