In Disney theme parks, this is the area where guest
s are not allowed, tucked away behind indescript doors and curtains. In reality, these areas are usually quite ugly, disgusting, and very unkempt. This is also where you see many a cast member doing what they normally are not allowed to do onstage
: eat, drink, smoke, use the restroom, talk on their cell phones, talk about their personal lives, be unfriendly.
See also: cast member
I need to go backstage for a minute to answer my phone.