@murrayjames

坑爹 is a relatively new internet word/ slang which has lots of meanings depending on the contexts. Usually it's used to express a feeling of being taken advantage of, being cheated or just not lucky. 坑爹 usually means 坑(to entrap; to cheat)我. In this case, I think your friend wanted to say he's not lucky, because of 骨折, he will miss the live show, what a bummer. He feels very 倒霉.

Check out this song, then you will have a better idea of 坑爹...haha

http://music.baidu.com/song/35210419?pst=sug