look up any word, like thot:
 
1.
A very potent, expensive strain of weed popular in the northeast. Has a very unique taste and very strong smoke even though it burns slower then other strains. Can run up to 65$ an eighth. People often call what they are selling granddaddy purple when they are really selling a lesser grade of purple (i.e. grape goo, purple Kush)
"I just copped a P of Granddaddy Purple from the club"

"I got grapes yadida?"
by TheStudioDankster650 October 09, 2006
 
2.
three way cross of Purple Urkel, Grape Ape, and Lavender. These three strains came from the same mother.
yeah, I gots dat Granddaddy Purple. Who's got the wrap?
by Thebestweed'sfromMendo May 06, 2007
 
3.
A dank ass strain of marijuana. It's parent plants are (Big Bud x Purple Erkle). Whoever thinks otherwise is wrong. Usually classified as 'exotic'. It has purple leaves but is not completely purple. Looks frosty with trichomes and has lots of orange hairs. Smells and tastes great and fruity, like its parent plant, Purple Urkel. Very potent. Sometimes expensive (20-25 a G)Commonly called 'GDP' for short.
Lucky Dude: Damn, I just got a quarter of some dank purp, man, it's GDP.

Unlucky Dude: Damn, man, Grand Daddy Purple? All i can find is bammer weed around here.
by 19billy March 12, 2009
 
4.
A clone only strain of marijuana popular in California, especially in the SF bay area. Purple Urkle X Salmon Creek Big Bud. Indica dominant.
Grand Daddy Purple is everywhere, and I'm not complaining!
by Skybwozzzz January 29, 2010