I love weed nigga, I got a green thumb

from Flatbush Zombies – Face-Off (L.S.Darko) (Prod. By Erick Arc Elliott) Lyrics on Rap Genius

When you crush alot of good quality weed with your thumb, it tends to rub off and make your thumb green, hence saying he has a “green thumb”

Also, people who have an affinity for growing plants are said to have a ‘green thumb.’ He is probably good at growing weed, and the kief from the weed sometimes gets on your fingers, giving them a green tinge.

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