urnebes

1. uproar; commotion; pandemonium
   Kad je počela utakmica, u kafani je nastao urnebes. — When the match started, the café erupted into an uproar.
   Deca su napravila pravi urnebes u stanu. — The kids caused total pandemonium in the flat.
2. colloq. riot; something hilarious
   Taj film je čist urnebes, moraš da ga gledaš! — That film is an absolute riot, you have to watch it!
   Njegova priča o putovanju bila je urnebes. — His story about the trip was hilarious.

The adjective urnebesan usually means "hilarious": urnebesna komedija.