Merriam-Webster Collegiate Dictionary - buster

 noun  Date: 1831  1.  a. chiefly Midland someone or something extraordinary a ~ of a breakfast — Harriet B. Stowe  b. an unusually sturdy child  c. often capitalized fellow — usually used as a form of address hey ~, come here  2. chiefly Australian a sudden violent wind often coming from the south  3. one that breaks, breaks up, or eliminates something crime ~s : as  a. plow  b. short for bronco~ a person who breaks horses  4. a bad fall