The idiom ‘chew the fat’ is believed to have originated from the practice of early sailors who would engage in lengthy conversations while sharing food, particularly when eating fatty cuts of meat or jerky. This expression likely reflects the slow, leisurely pace of these discussions, much like the act of chewing. Over time, the phrase evolved to describe casual chatting or gossiping, typically over a drink or food, implying a relaxed atmosphere where stories and experiences are exchanged.
Moreover, some sources trace the phrase back to the 19th century, where it appeared in various forms in English literature, suggesting it was a common practice among close friends or family members. Thus, ‘chewing the fat’ has become a vivid metaphor for informal dialogue, emphasizing the enjoyment of shared company and conversation.