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Packing a cigarette with marijuana after removing some of the tobacco. Useful for smoking in public areas, since it appears to be a normal cigarette. Usually packed into the cigarette using a pencil (which fits perfectly), hence the term.
Let's pencil pack a couple and go smoke on the white house lawn.
A lazy person; a pencil that is still sharp has obviously not been used, and is therefore not doing a lot of work. It also sounds like a compliment, so you can troll people with it.
Why are you here? You really are the sharpest pencil in the pack, aren't you?