"jack" is used to describe the act of the stolen punch.
it is usually hysterical, and described as a practical joke pulled on your face. Sometimes, it improves upon the facial features.
Sometimes an act of love, and sometimes an act of selfishness and hate.
"fool, you finna' get jack-jawed if you don't shutup.'
"we gon finnd you, we gon fiiind you. You finna' get jack-jawed. go tell THAT."