dine out on (something)
1. To be invited to a social meal (especially dinner) because of something particularly interesting or entertaining that one knows or has experienced. He dined out on the story of his affair with the movie star for several months.
2. To entertain other people, especially at a meal, with a particularly interesting story of something one has experienced. I always dine out on the story of our mishaps in Bavaria—to this day, it still puts people in stitches!