out of thin air meaning

• Adverb: out of thin air
  1. Without warning
     "your cousin arrived out of thin air"
     - out of nothing, from nowhere
• 
  [American idiom]
  out of nowhere; out of nothing. (Informal.)
  • Suddenly—out of thin air—the messenger appeared.
  • You just made that up out of thin air.
  
• 
  [American slang]
  Fig. out of nowhere; out of nothing.
     Suddenly—out of thin air—the messenger appeared.
    You just made that excuse up out of thin air.

• pull something out of thin air:    [American idiom]to ...
• pull sth out of thin air:    [American slang]Go ...
• into thin air:    [American slang]ad ...

Examples

1. ice rinks don't just appear out of thin air
2. so how can you say i don't come out of thin air
3. what, did you just pull that out of thin air
4. people like you don't come out of thin air
5. how can we believe you ? what you have said is out of thin air