bust;er pronunciation: function: noun date: 1831 1 a chiefly midland : someone or something extraordinary lt;a buster of a breakfast — harriet b. stowegt; b : an unusually sturdy child c often capitalized : fellow —usually used as a form of address lt;hey buster, come heregt;2 chiefly australian : a sudden violent wind often coming from the south3 : one that breaks, breaks up, or eliminates something lt;crime bustersgt;: as a : plow b [short for broncobuster] : a person who breaks horses 4 : a bad fall