Top Definition
A joint that is comprised of the roaches of other joints. Makes for superb smokage. The roach that comes from the "roach joint" itself is a "grandfather roach", a bit of weed that has somehow survived two joints. Hence, a "grandfather joint" is in turn a joint rolled, comprised of grandfather roaches, and just a delight to smoke with your buddies.
Stonerman 1: We're fucking out of weed?!?

Stonerman 2: Well we still got those roaches.

Stonerman 1: Well shit...

(10 minutes later)

Stonerman 1: Let's roll a roach joint!
by pureglaucoma March 04, 2011

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