The term "chew fat" refers to idle chatter or casual conversation. To express the opposite meaning of this term, one could use antonyms such as "meaningful discussion," "productive talk," or "serious conversation." These antonyms suggest a more substantive exchange of ideas, rather than superficial or trivial banter. Other possible antonyms for "chew fat" might include "focused dialogue," "purposeful communication," or "direct conversation." By using these antonyms, speakers emphasize the importance of clear, purposeful communication that is aimed at achieving a specific goal or objective.