on like a pot of neck bones
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 like pot 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.,
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.,