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One who is all knowing about weed and different methods of toking. Every stoner has a friend who is a Ganjaseur.
Dave: Hey man, do you know what kind of bud this is? Or the best way to toke?
Mike: Naw, not by eyeing it, but my friend Alex is a Ganjaseur, he'll know for sure.
by Loagie Bear June 08, 2009
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