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Usually assumes the form of an insecure wannabe badass with a chip on the shoulder the size of a buick, and an IQ number less than their shoe size. Your average knellerhead can usually be found trolling internet bodybuilding forums under multiple psuedonyms... but can also be described as an overzealous, pompous, or vexatious asshole that most people wish were killed with a Mortal Kombat fatality.
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