What is short movie mode on my camera?

I just got my new Nikon and there's a mode called 'Short movie show mode'. I was hoping someone could tell me what it was? When I press the shutter button it just takes a normal pic…

It's in your User's Manual. I'm not going to look it up for you and tell you what it is, unless you are disabled and can't do it for yourself.

What does the manual say?