Does anyone knows what "Fifalleralla" means in Swedish?
It doesn't mean anything in Swedish, or any other language.
The sole reference to the "word" I could find was to a 1876 German novel. In one chapter, there is a folk song sung in a tavern with the words:
"A magpie sits in a tree.
With "fifalleralla" apparently representing the sound of a magpie singing.
Like "Cockadoodle Doo" is supposed to represent the sound of a rooster crowing.
The "fif" element is a vague reference to a whistling sound, pfeiffen in German. The rest is nonsense syllables.