title: What is a "slug"?
body: <p>I am attempting to upload some emoticons to a particular site. The mandatory fields are:</p>
  
  <p>Shortcut:</p>
  
  <p>Image:</p>
  
  <p>Category:</p>
  
  <p>Suggested Category:</p>
  
  <p>For the image, I just choose it from my file. Category fields are explanatory. I was trying to enter a web url as the "shortcut", and get this error:</p>
  
  <p>"Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens"</p>
  
  <p>I need to know what a "slug" is and how to create/get one.</p>