slang A frivolous issue or problem that is only a source of great concern or frustration because the speaker lives in an economically-developed country; a minor issue compared to the hardships faced by those living in so-called "third world" countries. A: "I can't believe the Wi-Fi is down. What am I supposed to do if I can't watch Netflix?" B: "Hello first world problems!" I just got back from a service trip to Haiti, and things I was worried about before I left just seem like first world problems now.