Hello, I didn't get the whole meaning of this expression; its just like an emphasising idiom?
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Yes, this is an idiom.
Better to give more context, but you are correct. It means that someone stands up quickly, and is generally used to emphasise surprise or eagerness. No "jumping" need actually be involved....
I'm not a teacher of English, but I have spoken it for (almost) all of my life....