cool story, bro. now go make me a sandwich
This phrase is commonly used to imply that you don't really care. Mostly used after lengthy discussions, and boring topics.
Girl 1: I was eating a burrito, and suddenly i forgot my guacamole! So i rushed to the store, but they were all out. All they had were fajitas, so i grabbed one of those and headed back. Can you believe that?
Girl 2: cool story, bro. Now go make me a sandwich.
Girl 2: cool story, bro. Now go make me a sandwich.