Duff

The leftover weed from a depleted vaporizer. It is often used to make canna-butter or sprinkled on food as an edible, since the the THC has been activated by the heat of the vaporizer.

Stoner 1: Damn, we’re out of weed!
Stoner 2: I got this duff , we could just eat some of that.

Stoner 1: Aw, hell yeah, let’s get blazed.