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An Italian Dialect word, probably meaning jerk or loser, though now used to describe clumsy or idiotic people, sometimes people that cause embarrassment, or even people that you see to be humorous in just being themselves.
*Peter drops his iPhone and screen cracks* John- "Peter you're such a fesso!"

*Peter rocks up to school wearing a pink lycra suit* John- "Peter you look like an absolute fesso"

*Peter gains stacks of weight over the summer holidays, and now looks like Barney the Dinosaur* John- "Dad ave you seen Peter? What a Fesso!"

*Peter embarrasses himself by saying 'hey' to a girl and then tripping over and farting at the same time* *John grabs a whiteboard marker and writes fesso on Peters head*
by Fesso Head September 11, 2013
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