Yeah. Means that one must get started at what he has to do (which has been postponed)
To the norsk natives: Do you use this expression in your daily life or is it frowned upon as vulgar?
It's not exactly formal, but there's a version of this expression that's really vulgar; "få ræven i gir" which means get your ass in gear.
That's interesting because the expression isn't quite so 'shocking' when spoken in English. Are there any other expressions that are mild in English but easily construed as vulgar in Norwegian?
I am a native English speaker and think it would be considered quite vulgar in English. I wouldn't use it.
på dansk er det ret aggressivt, men om du kan tillade dig det, kommer selvfølgelig an på, om du taler til dronningen eller til din undersåt :P