keef
The powdery substance made up of THC crystals from the bud of cannabis. It's basically the Cheetos dust that gets left behind on your fingers after finishing a bag of chips, but in this case, with weed.
Example:
1: Look at all the keef I collected in my grinder!
2: All mine got stuck on my fingers from piecing the buds.
1: Look at all the keef I collected in my grinder!
2: All mine got stuck on my fingers from piecing the buds.