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A person who smokes pot but still exceptionally excels in assorted aspects of life.
"Dude don't smoke pot, it will make you lazy."
"Don't worry man, I'm a phelpster. I've been getting straight A's since I was 5."

"Jon is a phelpster. He smokes a ton of pot but can still run faster than anyone I know."
by R $money$ February 03, 2009
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