1. a rare condition where someone mistakenly believes they are a expert without peer in any topic they overheard others talking about, most often to the point of arguing without point or merit for hours at a time about things they know nothing about; the fact they barely fumbled through high school and have since wasted nearly a decade of their life is irrelevant, for they always assume absolute correctness.
I can't believe that asshole thompsoned us for four hours on how charcoal works at Dan's barbeque. I'm glad he broke his leg.
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