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An academic who's lack of "street" experience causes an over reliance and fixation upon standard academic discourse despite overwhelming practical considerations.

(In reference to the color of the lampshade of desk and table lamps often seen in academic settings)
"Who, Jim? Ignore him regarding this issue as he has no "real world" experience with it. He's a classic green lamper: Raised in a sheltering family, off to private school, then nothing but academic study for 10 years."
by Martin Peter May 21, 2007
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