Top Definition
A largely pejorative term for an eccentric or even slightly idiosyncratic individual with a penchant for mischievous and perhaps reckless behavior.

Derived from the curious appearance of Former Toronto Blue Jay and Seattle Mariner John Olerud, who famously wore a batting helmet in the field as a first baseman.
"Olerud, don't you realize that if you put canned goods in the microwave that bad stuff can happen?"
by Nadalgaenger77 July 18, 2010

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