In the early 1700's the cut of the jib sail, often signified the nationality of a vessel. The term was being used figureatively by the 1800's to express like, or dislike for someone. So, the 'Cut of one's jib' refers to their general appearance of personality.
Little Jr. Son of a bitch: Hi Mr.
Me: I don't like the cut of your jib.
when something starts to or begins to happen. When neck bones of chicken are prepared to eat, they are boiled. When they are boiling , they are "on".
Two folks disagree on something and start to argue or fight, then "It's on likepot of neck bones"
or
A person or group decides to do something, and the act of actually doing it is "It's on like a pot of neck bones".
etc.,