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.
Used by us males as an effective counter to those whining cumdumpsters complaining about every single shit that happens to them by asking them to make us a sandwich. There is currently no known counter to this godly phrase as those pea-brained pastry chefs can't think of any and have no choice but to obey.