Finger Kief

The finely ground marihuana weed that falls on the table during packing; named "finger kief" due to being picked up off the table with your fingertip, so as to prevent waste.

Guy 1: Want me to pack you a bowl?
Guy 2: Of course. Just make sure you use the finger kief, I only have like a gram left!

Being an impoverished stoner, Joe always used every last bit of his finger keif.