A grandaddy joint is a marijuana cigarette produced during times of desperation, made of many already-smoked spliff ends or roaches from previous smoking sessions. It is called a grandaddy because it is an old ass decrepit and sour joint reminiscent of the smell of elderly people, these spliffs are particularly difficult to inhale and are almost unenjoyable to smoke.

Grandaddy ingredients may include the following: weed, hash, stale tobacco, dust, keef, dead skin flakes, and any other dirty ashtray contents.
"Man got so fukn low on weed the other night i smoked a grandaddy joint with my grandad, was so stale it almost killed him"

"you know times are tough when you don't even have endies for a grandaddy"
by Thumbiwa August 13, 2018
Get the Grandaddy joint mug.