windfall

• Meaning: unexpected good fortune (originally means ripened fruits that fall from the tree)
  
• In Hong Kong slang: 筍野， 無啦啦執到， 粗野(as in 撈粗野)， 淨袋
  
• In decent Chinese: 意外收穫， 意外之財
  
• Where we first met: The Scotsman.com - a lady who won a fortune in a lucky draw donates her windfall to charity.