The one who get the herb man what he need.
"Hey man can i get a sack?"
"Fuck dude im out. I gotta re-up"
"Call up Dr. Greenthumb. Hes got some mad chronic"
A song by the hip hop (and hip hop/metal crossover) band, Cypress Hill.
It can be found on their fourth album, imaginatively titled 'IV'.
Its subject matter relates to the above definition (i.e. Marijuana use, or a nickname of someone proficient at its cultivation).
Hey, have you heard that Cypress' track Dr Greenthumb?
Yeah, it's fucking cool. Pass that joint.
n- one who is proficient at the growth of and/or use of cannibus sativa.
Dr. Greenthumb is lookin fuckin high tonight!
the guy who everyone knows sells pot but is yet to be caught. He may possibly be your dealer, mostly likely grows his own stuff or has a large supply, often cheap sometimes medical
usually dosent smoke his own stuff.
person1: so who are we looking for?
person2: my Dr. Greenthumb
person1: oh that dude that stands in the ally by safeway with the afro and trench coat and box of lighters?
cop1:that guy in the hoodie over there is a Dr. Greenthumb
cop2: i know but he never has any on him or at his house.