1.  act or talk like a fool
2.  talk nonsense

• 1. 乱弹琴: Shit Song
• 2. 对牛乱弹琴: Keso | Playin' with IT

• 1.花几千块美金在动物身上，简直是乱弹琴！
  Spending thousands of dollars on an animal is outrageous!
  dict.yoduao.com
• 2.例句：什么？不上大学了开乐队？真是乱弹琴！
  E. g: What? Give up the university study and open a band? This is really talking nonsense.
  dict.yoduao.com

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