Ok,
The idiom "out of here" means going or leaving (source)
So, I am out of here=I am leaving (not sure it means "I am moving out right now" or "I will move out shortly")
Now, we also have "I am so out of here".
My question is: does "so"="extremely" in this case?
So, "I am so out of here" = "I am extremely out of here".
But, seem noone says "I am extremely out of here", right?