The beast was his nickname given by the media, his nickname in Cosa Nostra was Tiny.
The literal translation is "the short one" - "u curtu" is the Sicilian word for "il corto" in Italian.
By the way, how many of them are nicknamed for being of short stature:
Antonino Imerti ('Ndrangheta boss of Fiumara di Muro) - Ferocious dwarf (nano feroce)
Girolamo Marino (Cosa Nostra boss of Paceco, Trapani province, whacked in 1986) - Mommo u nanu (Mommo the dwarf)
Antonino Lo Giudice ('Ndrangheta boss in the Santa Caterina district in Reggio Calabria) - Il nano (the dwarf)
Thomas
"Shorty" Spero (Colombo family)
Ralph
"Shorty" Caleca (St.Louis family)
Little Nicky Scarfo
Also, wasn't Amuso somtimes called "Little Vic"?
And there is also a photo of Casso walking near a huge guy that makes Casso look like a dwarf by comparison. Didn't Casso ever get a nickname because of this, or "Gaspipe" is the only one?