1. 歌词不伦不类
obscene/indecent/ill-mannered lyrics.
中文也可以说 "没品味/不像话/低俗的歌词".
2. 你一边待着去。
You stay away. (You go stay put elsewhere.)
May sometimes be written as "呆着", but I prefer "待着".
3. 有事没事
For no apparent reason.
中文也可以说 "动不动"。
例句:
你不要有事没事就来找我。
你不要动不动就来找我。
Don't just come over whenever you feel like it (for no apparent reason).