The common norwegian slang version for testicles, like nuts, though its in singular form (balle - nut).
Often used as an exclamation of dismay or irritation.
Has loosly the same effect as "damn!".
"Balle! Jeg glemte å hente henne etter festen, hun måtte sikkert gå hjem i regnet!
"Damn! I forgot to pick her up after the party, she probably had to walk home in the rain!"