The word DIY is a common phrase in British English. It can also be used as a joke to refer to other things, such as the waiter not doing his job at a restaurant. A do means a party - so if you're going to a do, it just means you are going to a party. To feel done in can mean like you feel really gutted or upset and disappointed. This is becoming a running theme in Luke's English podcast where I discover things that I could do podcasts about. Every time I open my mouth, I feel like, Oh, there's another episode of the podcast. All I can see is podcasts.