Where does “sfirricchia” come from?

sfirricchia (Sicilian) comes from Sicilian sferra, from Vulgar Latin *exferra.

Ancestry of “sfirricchia”, step by step

Step	Language	Word	Meaning
1	Sicilian	sferra	broken old exhausted horseshoe after it is taken from the hoof of the horse
2	Vulgar Latin	*exferra	—