What is the origin of the idiom "chew the fat" and when to use it?

The idiom "chew the fat" has its origins in seafaring communities, particularly among sailors. It was initially a nautical expression used during the 19th century, referring to the act of sailors sitting together and leisurely chewing on tough, salted fat while engaging in casual conversation. Over time, the expression evolved into a figurative idiom, signifying a relaxed and informal conversation, often centered on friendly banter or gossip.