Slang for the infamous black tip ammunition used in 5.56x45mm. Illegal for the general public and therefor is spoken in slang.
A: "You've should have seen how i test fired my angry pencils last week!"
B: "I'm calling the ATF"
To restart an action/activity in hopes of a better more favorable outcome.
1: Aww Shuck. I'm getting overrun by barbarians i might need to pull a Liran
2: You suck