title: What does 'add dynamic method' do in Groovy/IntelliJ?
body: <p>When I use an undefined method in Groovy/IntelliJ, and I press alt-Enter, I get the following option: "Add dynamic method". When I do it, I get a "dynamic properties" windows with a new dynamic property. </p>
  
  <p>I don't understand how to use this dynamic property/method. Where do I define it? What does it mean?</p>