1/8 of an ounce (3.5 grams) of marijuana(or more) rolled into a blunt. It is monstrous and keeps you high for hours. The term comes from the way it looks once it is rolled because it resembles a gorrilla's finger.
Playa: yo dawg i just picked up a fat weed sack.
Dawg:playa playa! how much did you pick up?
Playa: you know I only pick up ounces dawg!
Dawg: Yo playa lets pick up a blunt wrap and roll ourselves a gorrilla finger!
A Large Marijauna filled cigar that replicates a gorilla's finger.
Jonhy Boy rolled a monster Gorrilla Finger I was elevated.