It implies a relaxed, friendly conversation, typically with no specific purpose or agenda. Think of it like a laid-back hangout with friends, where you just talk about anything and everything.
Here are some examples of how to use "shoot the breeze":
* "We spent the afternoon shooting the breeze about old times."
* "I like to shoot the breeze with my colleagues over coffee."
* "They were just shooting the breeze on the porch, enjoying the warm weather."
The origin of the phrase is unclear, but it likely refers to the act of "blowing smoke" or "talking nonsense" – similar to how someone might shoot a gun without aiming.