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1.
The mass of resin that builds up in a glass pipe from smoking marijuana.
"Dude, we are all out of pot."

"Well, we could always take a dip in the resinvoir."
by cda187 January 23, 2013
 
2.
noun: site of built up resin; place where resin is scraped from
After running out of pot and having scraped the last of the kief, Garry had no choice but to tap into the resinvoir.
by bujiburner August 08, 2012