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2.
One who sells and/or consumes extremely large amounts of cannabis

Derived from the term 'whoremonger'
Joe: Great Scott! Mike sells three kilos in a week, and smokes even more in that time! How stoned he must be!

Steve: Indeed, he is quite the weedmonger, if I do say so myself.
by Deus Cannabis October 25, 2009
 
1.
One who does not know when to stop smoking after getting high.
Guy1: Lets go get another blunt!
Guy2: Are you serious? We are already stoned! You're such a weed monger.
by Jaymaur94 December 30, 2009