A teen or tween who thinks they know it all, wise fool
Teen+genius=teenius
Sarah rolled her eyes when her parents wouldn't believe that euthanasia was the word to describe children in China... What a teenius.
by Don W Macaulay June 16, 2013
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teenage super-geniuses who annoy everyone else with their obnoxious, mostly useless, plethora of knowledge
She was pretty upset when a bunch of high school teeniuses pointed out that pluto wasn't a planet.
by waffleguy4 November 20, 2009
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