Top Definition
Hydro Grand-daddy Purp. Indica dominant weed. Same thing as Granddaddy Purp except its grown by a hydroponics system making the weed more potent. Non-frequent smokers will get knocked on they ass after a couple hits.
"Ayy breh lets hit up the club in the Sco Im tryna get some HGDP"

"fuck that I get it Cheaper in Oakland"
by Purpzbreh September 06, 2010

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