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Mostly male person who enjoys ending friendly arguments over scientific matters, which could have gone for hours and would have entertained both the people arguing and the audience, by pulling out his smartphone and declamating "on wikipedia, it says..". Is closely related to the hipster. The smartanusness of an individual is inversely correlated to its self-esteem and penis size.
John: "Man, I am totally sure! Tomatoes grow on trees!"
Jack:"Dude, where do yo get this from? Tomatoes are roots!"
Corey: "On Wikipedia, it says..."
John: "Put that phone down, you Smartanus, or Iยดll shove it up your ass!"
by tadahbadumtss June 22, 2012
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