Know how to use "fewer" and "less"? Find out.
1968, North American colloquial, perhaps a blend of scummy and fuzzy [Barnhart]. First attested use is in reference to Ratso Rizzo in "Midnight Cowboy."
Dirty; filthy; repellent; grungy: a bunch of scuzzy Moroccan A-rabs
[1960s+ Teenagers; origin unknown]
The usual pronunciation of SCSI.