I have come aross it in the movie Ful Metal Jacket. Here is the scene. It's at around 10 seconds.
It should take 10 seconds to negotiate this obstacle. Quickly move it out!
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I believe "Move out" or in this case "Move it out" has entered English from military language.
It's most literal meaning is the command "Leave this place now!"
It usually follows other orders, so it's more common meaning is "start carrying out my orders now". But it still implies the order to leave.
Run round the block. Move out!
This would mean "Go outside and run round the block now!"