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Another phrase for a pothead or stoner.. someone who smokes alot of marijuana. It has a sort of negative connotation.
Joe: "Damn that test was hard. Do you think Mark passed?"
Adam: "Nah man, Mark is a fuckin' reefer rat."
Joe: "Haha, yeah, you're probably right..."
by Willllllllllllllllllllllll February 10, 2006
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