What is "bustino"

Bustino (foaled 1971) was a British Thoroughbred Champion racehorse and sire. In a career which lasted from August 1973 until July 1975 he ran nine times and won five races. He was the best British three-year-old of 1974, when his wins included the Classic St Leger, as well as the Sandown Classic Trial, Lingfield Derby Trial and Great Voltigeur Stakes. As four-year-old he won the Coronation Cup in record time and finished second to Grundy in the King George VI and Queen Elizabeth Stakes in what was described as the Race of the Century.