Abbreviations which I saw when I played Transformice

In the begining  First, I want to tell you a little about Transformice. It's a game as you can understand about mice which need take the cheese and go into the hole. Actually most of the players whom I know are schoolkids from the different countries. When I just began to play it was difficult to understand all the abbreviations and phrases I saw there, like "ty", "yw", "abt", "idk" etc. And also there are sometimes words I haven't seen before, but it's good experience for me while I'm learning English.