Today someone offered me to join them for a card game, but I was heading out for something. I turned and said
"I am good, thanks"
and left them because I was in such a hurry that I had to leave the building as soon as possible.
I am using this response a lot when I am full and someone offers food or drink. I honestly think this can only be used in the context of talking about foods and drinks!
Was that line of response idiomatic or even correct?