Originally posted by Fzanco:

Maybe it's supposed to mean "onwards" or "get on your way" or as Italians might say "andiamo" Something like that. It would make sense if you were leaving them. I can't remember when they say it though, does anyone else remember if they say it when you arrive or when you leave?

Åtett år "åt ett" really doesn't make sense in Swedish as a greeting or a single phrase ('for a' or 'towards a', or 'ate a'). 'Towards' by itself would be translated as 'mot'. So maybe its just gibberish, even though we have real words like fuling and moder.